Sinceramente non riesco a capire…
Per completezza ti copio e incollo tutto il codice, magari nel ricopiare prima ho omesso qualcosa di importante.
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\documentclass[12pt,twoside,b5paper, openright]{book}
\usepackage[italian]{babel}
\usepackage{fancyhdr}
\usepackage{ibycus4}
\usepackage{needspace}
\usepackage{jurabib}
\usepackage{bibtopic}
\usepackage{ucs}
\usepackage[utf8x]{inputenc}
\usepackage{setspace}
\usepackage{tipa}
\usepackage{longtable}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{multirow}
%\usepackage{showidx}%ricordati di eliminare questo pacchetto prima di mandare in stampa!
\usepackage{imakeidx}
\indexsetup{level=\section, toclevel=section, noclearpage}
\providecommand*\see[2]{\emph{\seename} #1}
\providecommand*\seealso[2]{\emph{\alsoname} #1}
\providecommand*\seename{vedi}
\providecommand*\alsoname{vedi anche}
\newcommand{\nn}[1]{#1n}
\addtolength{\evensidemargin}{-1cm}
\addtolength{\textwidth}{2cm}
\addtolength{\voffset}{-2cm}
\addtolength{\textheight}{2.8cm}
\addtolength{\headheight}{0.6cm}
\newcommand{\superscript}[1]{\ensuremath{^\textrm{\scriptsize{#1}}}}
\newcommand{\subscript}[1]{\ensurema\giulia\Documenti\Tesidott2\th{_\textrm{\scriptsize{#1}}}}
\jurabibsetup{
authorformat=smallcaps,
authorformat=citationreversed,
authorformat=reducedifibidem,
authorformat=year,
titleformat=italic,
titleformat=commasep,
titleformat=noreplace,
citefull=chapter,
commabeforerest,
bibformat=nohang,
dotafter=bibentry,
pages=format,
howcited=compare}
\renewcommand{\biblnfont}{\textsc}
\renewcommand{\bibfnfont}{\textsc}
\renewcommand{\bibelnfont}{\textsc}
\renewcommand{\bibefnfont}{\textsc}
\renewcommand{\bibtfont}{\textit}
\renewcommand{\bibapifont}{\textit}
\renewcommand{\bibbtfont}{\textit}
\renewcommand{\bibjtsep}{in }
\renewcommand{\bibbtsep}{in }
\renewcommand{\bibatsep}{, }
\renewcommand{\bibansep}{, }
\renewcommand{\bibbdsep}{}
\renewcommand{\bibpldelim}{}
\renewcommand{\bibprdelim}{}
\renewcommand{\jbbtasep}{ — }
\renewcommand{\jbbtesep}{ — }
\renewcommand{\jbbfsasep}{ — }
\renewcommand{\jbbstasep}{ — }
\renewcommand{\jbbfsesep}{ — }
\renewcommand{\jbbstesep}{ — }
\renewcommand{\bibbtasep}{ — }
\renewcommand{\bibbtesep}{ — }
\renewcommand{\bibbfsasep}{ — }
\renewcommand{\bibbstasep}{ — }
\renewcommand{\bibbfsesep}{ — }
\renewcommand{\bibbstesep}{ — }
\renewcommand{\jbcitationyearformat}[1]{#1}
\renewcommand{\bibpldelim}{(}
\renewcommand{\bibprdelim}{)}
\renewcommand{\biburlfont}{same}
\renewcommand{\urldatecomment}{. }
\renewcommand{\biburlprefix}{, sito internet:~}
\renewcommand{\biburlsuffix}{}
\AddTo\bibsenglish{\renewcommand*{\urldatecomment}{Ultimo aggiornamento: }}
\AddTo\bibsenglish{%
\def\jbpagename{p.~}%
\def\jbpagesname{pp.~}%
}
\newcommand*{\bibhowcitedprefix}{(}
\newcommand*{\bibhowcitedsuffix}{)}
\pagestyle{fancy}
\renewcommand{\chaptermark}[1]{\markboth{\thechapter.\ #1}{#1}}
\renewcommand{\sectionmark}[1]{\markright{\thesection.\ #1}}
\clearpage{\pagestyle{empty}\cleardoublepage}
\let\origdoublepage\cleardoublepage
\newcommand{\clearemptydoublepage}{%
\clearpage
{\pagestyle{empty}\origdoublepage}%
}
\let\cleardoublepage\clearemptydoublepage
\usepackage[pdftex]{hyperref}
\makeindex[title=Indice dei nomi e delle cose notevoli, columns=2]
\makeindex[name=latino, title=Indice dei termini latini, columns=2]
\makeindex[name=altre, title=Altre lingue indoeuropee, columns=2]
\makeindex[name=AutoriA, title=Indice degli autori antichi, columns=2]
\makeindex[name=autori, title=Indice degli autori citati, columns=2]
\begin{document}
\hyphenation{ra-tio-nem Leon-hard Bergk e-di-tio ri-pro-du-zio-ne}
\frontmatter
\setstretch{1}
\include{title1}
\cleardoublepage
\include{dedica}
\setcounter{secnumdepth}{-1}
\setcounter{tocdepth}{5}
\setstretch{1}
\cleardoublepage
% \renewcommand{\chaptermark}[1]{\markboth{#1}{#1}}
% \renewcommand{\sectionmark}[1]{\markright{#1}{}}
\fancyhf{}
\fancyhead[LE,RO]{\thepage}
\fancyhead[CE,CO]{\nouppercase{\leftmark}}
\tableofcontents
\listoffigures
\listoftables
\setlength{\parindent}{0.5cm}
\mainmatter
% \renewcommand{\chaptermark}[1]{\markboth{#1}{#1}}
% \renewcommand{\sectionmark}[1]{\markright{#1}{}}
\fancyhf{}
\fancyhead[LE,RO]{\thepage}
\fancyhead[CE,CO]{\leftmark}
\include{Premessa}%definizione del campo d'indagine — FATTO!
\setcounter{secnumdepth}{2}
\fancyhf{}
\fancyhead[LE,RO]{\thepage}
\fancyhead[CO]{\nouppercase{\rightmark}}
\fancyhead[CE]{\nouppercase{\leftmark}}
\include{Carmen}%cos'\`e il carmen saliare, storia e fonti, carmen vs. carmina — FATTO!
\include{Storia_CS}%tradizione manoscritta — FATTO!
\include{Status_CS}%storia delle interpretazioni — FATTO!
\include{Edizione_CS}%nuova edizione del testo e commento — FATTO!
\include{Lingua_CS}%considerazioni linguistiche sul CS — FATTO!
\setcounter{secnumdepth}{-1}
% \renewcommand{\chaptermark}[1]{\markboth{#1}{#1}}
%\renewcommand{\sectionmark}[1]{\markright{#1}{}}
\fancyhf{}
\fancyhead[LE,RO]{\thepage}
\fancyhead[CE,CO]{\nouppercase{\leftmark}}
\include{Conclusioni}%FATTO!
\setstretch{1}
% \renewcommand{\chaptermark}[1]{\markboth{#1}{#1}}
% \renewcommand{\sectionmark}[1]{\markright{#1}{}}
\fancyhf{}
\fancyhead[LE,RO]{\thepage}
\fancyhead[CO]{\nouppercase{\rightmark}}
\fancyhead[CE]{Le fonti classiche}
\include{Appendice} %Raccolta di tutte le fonti che citano il carmen saliare o i Salii — da mettere in ordine cronologico! — FATTO!
\setcounter{secnumdepth}{1}
%\setstretch{1}
\setcounter{secnumdepth}{-1}
\bibliographystyle{jurabib}
\nocite{*}
% \renewcommand{\chaptermark}[1]{\markboth{#1}{#1}}
% \renewcommand{\sectionmark}[1]{\markright{#1}{}}
\fancyhf{}
\fancyhead[LE,RO]{\thepage}
\fancyhead[CO]{\nouppercase{\rightmark}}
\fancyhead[CE]{\nouppercase{\leftmark}}
\chapter{Riferimenti bibliografici}
\begin{btSect}{bibliouno}
\section{Fonti classiche}
\btPrintAll
\end{btSect}
\begin{btSect}{bibliocinque}
\section{Fonti classiche in traduzione}
\btPrintAll
\end{btSect}
\begin{btSect}{bibliodue}
\section{Edizioni del \emph{De Lingua Latina} di Varrone}
\btPrintAll
\end{btSect}
\begin{btSect}{bibliotre}
\section{Edizioni del \emph{De Orthographia} di Terenzio Scauro}
\btPrintAll
\end{btSect}
\begin{btSect}{biblioquattro}
\section{Edizioni del \emph{De verborum significatione} di Festo}
\btPrintAll
\end{btSect}
\begin{btSect}{Kbib_CS}
\section{Altra bibliografia}
\btPrintAll
\end{btSect}
\chapter{Indici}
\printindex
\newpage
\cleardoublepage
\printindex[AutoriA]
\newpage
\cleardoublepage
\printindex[autori]
\cleardoublepage
\printindex[altre]
\end{document}
`
Ti allego il risultato ottenuto compilando questo codice.
Spero che tu riesca a darmi una mano. Grazie!
Giulia