References at the end of beamer slides

Question

I am preparing presentation with beamer and using pdflatex and bibtex. How can I put references at the end of a frame? What if I use allowframebreaks ?

I do not want all the references put together in one big frame at the end of my presentation, rather I want each reference as footnote on the frame where it has been used.

Note: I am using a custom bibliography style and author-year citation style.

MWE

\documentclass[xcolor=dvipsnames, 10pt]{beamer}
\usepackage[T1]{fontenc}
\usepackage{amssymb}
\usepackage{amsthm}
\usepackage{amsmath,bm,mathtools}

\usepackage{natbib}
\usepackage{bibentry}
\bibliographystyle{apalike}
\usepackage{chngcntr}


\counterwithin*{footnote}{page}
\newcommand\footcite[1]{\footnote{\bibentry{#1}}\label{\thepage:#1}}
\newcommand\secondcite[1]{\textsuperscript{\ref{\thepage:#1}}}



\setbeamertemplate{navigation symbols}{}
\definecolor{byublue}{RGB}{0 34 85}%added
\definecolor{mydarkgray}{RGB}{64 64 64}%added

\usecolortheme[named=MidnightBlue]{structure}%added
\usetheme{Montpellier}%Montpellier originally
\useoutertheme{tree}%added
\useinnertheme{circles}%added
\beamersetuncovermixins{\opaqueness<1>{25}}{\opaqueness<2->{15}}




\usefonttheme{professionalfonts} % using non standard fonts for beamer
\usefonttheme{serif} % default family is serif


\begin{document}
\nobibliography{bibliography_phd_journal_key}

\section{Introduction} 


\begin{frame}
\begin{center}
Some text \footcite{titanath2008p165326}
another test \secondcite{titanath2008p165326}
\end{center}


\begin{tabular}{|c|c|}
\hline 
Header\footcite{titanath2008p165326} & header \\ 
\hline 
1 & 2 \\ 
\hline 
\end{tabular} 
\end{frame} 


\bibliographystyle{mybibstyle}


\end{document}

I am using two external .bib files. One is the main .bib file and the other one is for journal name abbreviation.

Answer 1

If you are using natbib for references, then you can use the bibentry package to create references in footnotes. It should be noted that this is a bit of a hack, and it doesn't really implement a proper footnote reference style, but emulates one. To deal with subsequent citations (as you request in the comments) I've created a second command \secondcite which will place a footnote referencing the correct citation's original footnote number without duplicating the bibliography entry itself. Here's an example:

\documentclass{beamer}

\begin{filecontents}{\jobname.bib}
@book{Saussure1995,
    Author = {Ferdinand de Saussure},
    Origyear = {1916},
    Publisher = {Payot},
    Title = {Cours de Linguistique G{\'e}n{\'e}rale},
    Year = {1995}}

@book{Labov1972,
    Address = {Philadelphia},
    Author = {William Labov},
    Publisher = {University of Pennsylvania Press},
    Title = {Sociolinguistic Patterns},
    Year = {1972}}

\end{filecontents}
\usetheme{Montpellier}
\usepackage{natbib}
\usepackage{bibentry}
\bibliographystyle{apalike}
\usepackage{chngcntr}

\counterwithin*{footnote}{page}
\newcommand\footcite[1]{\footnote{\bibentry{#1}}\label{\thepage:#1}}
\newcommand\secondcite[1]{\textsuperscript{\ref{\thepage:#1}}}

\begin{document}
\nobibliography{\jobname}
\begin{frame}

  \frametitle{Stuff famous linguists asked}
  \begin{block}{A block}
       \begin{enumerate}
        \item Is it part of \emph{langue} or part of \emph{parole}?\footcite{Saussure1995}
        \item Is it socially stratified?\footcite{Labov1972}
        \item More Saussure\secondcite{Saussure1995}
       \end{enumerate}
  \end{block}
\end{frame}
% The next frame is a duplicate for testing purposes    
\begin{frame}

  \frametitle{Stuff famous linguists asked}
  \begin{block}{A block}
       \begin{enumerate}
        \item Is it part of \emph{langue} or part of \emph{parole}?\footcite{Saussure1995}
        \item Is it socially stratified?\footcite{Labov1972}
        \item More Saussure\secondcite{Saussure1995}
       \end{enumerate}
  \end{block}
\end{frame}


\end{document}

If you want the references to be one big frame, then using [allowframebreaks] is the way to go. I find the standard formatting of references in beamer overly garish, so I subdue everything:

\setbeamercolor*{bibliography entry title}{fg=black}
\setbeamercolor*{bibliography entry author}{fg=black}
\setbeamercolor*{bibliography entry location}{fg=black}
\setbeamercolor*{bibliography entry note}{fg=black}
\setbeamertemplate{bibliography item}{}

I also allow for the "(cont.)" to be used on subsequent slides:

\setbeamertemplate{frametitle continuation}[from second]

The references slide itself is simple.

\begin{frame}[t,allowframebreaks]
\frametitle{References}
\bibliography{<bibfile>}
\end{frame}
\end{document}