\documentclass{langscibook}    
\author{Pat Jaeung}
\title{Sample monograph}
\Series{cfls}
\SeriesNumber{99} 

\renewcommand{\lsISBNdigital}{000-0-000000-00-0}
\renewcommand{\lsISBNhardcover}{000-0-000000-00-0}
\renewcommand{\lsISBNsoftcover}{000-0-000000-00-0}
\renewcommand{\lsURL}{http://langsci-press.org/catalog/book/000} 
% \BookDOI{}%ask coordinator for DOI

\dedication{For Mom and Dad}
\typesetter{Jane Doe}
\proofreader{John Doe}
\BackBody{What everyone should know about monographs: it's here}

\setlength{\csspine}{25.0559784mm} 
\setlength{\bodspine}{20mm} 

\bibliography{localbibliography} 
\begin{document}     
\maketitle                
\frontmatter
\currentpdfbookmark{Contents}{name} % adds a PDF bookmark
\tableofcontents
% \include{chapters/preface}
% \include{chapters/acknowledgments}
% \include{chapters/abbreviations} 
\mainmatter         
\chapter{Introduction}
This is the introduction.
\chapter{New research}
This is the main argument.
\chapter{Conclusion}
This is the conclusion.

\backmatter
\phantomsection%this allows hyperlink in ToC to work
\printbibliography[heading=references] 
\cleardoublepage

\phantomsection 
\addcontentsline{toc}{chapter}{Index} 
\addcontentsline{toc}{section}{Name index}
\ohead{Name index} 
\printindex 
\cleardoublepage
  
\phantomsection 
\addcontentsline{toc}{section}{Language index}
\ohead{Language index} 
\printindex[lan] 
\cleardoublepage
  
\phantomsection 
\addcontentsline{toc}{section}{Subject index}
\ohead{Subject index} 
\printindex[sbj]
\ohead{} 

\end{document} 