\documentclass{report}

\def\papertitle{Analysis I}

\def\theorytitle{Theorie}
\def\corollarytitle{Daraus folgt}
\def\proposaltitle{Vorschlag}
\def\claimtitle{Behauptung}
\def\exercisetitle{Aufgabe}
\def\exampletitle{Beispiel}
\def\questiontitle{Frage}
\def\wrongctitle{Falscher Konzept}

\input{preamble}
\input{macros}
\input{letterfonts}

\title{\huge{\papertitle}}
\author{\huge{Jirayu Ruh}}
\date{}

\begin{document}

\maketitle
\newpage% or \cleardoublepage
% \pdfbookmark[<level>]{<title>}{<dest>}
\pdfbookmark[section]{\contentsname}{toc}
\tableofcontents
\pagebreak

\import{./}{disclaimer.tex}
\import{./}{analysis_I.tex}
\import{./}{analysis_II.tex}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% BIBLIOGRAPHY
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\addcontentsline{toc}{chapter}{References}
\bibliographystyle{apalike}
\bibliography{sources}

\end{document}