Change Bibliography Icon/Label with Beamer Class

Question

I'm doing a presentation in latex. I have included the references using bibtex, however, the references appear as images and not numbers:

Main code:

\documentclass[10pt]{beamer}
\usepackage{beamerthemeshadow}
\usepackage{graphicx}
\usepackage{epsfig}
\usepackage{hyperref}
\usepackage{tikz}
\usepackage{tikzpagenodes}
\usepackage{enumitem}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[english]{babel}

\tikzstyle{block}=[draw opacity=0.7,line width=1.4cm]

\title{My Presentation} 
\author{Thunder} 
\today

\setcounter{tocdepth}{1}

\begin{document}
\frame{\maketitle} 

\begin{frame}{Contents}
    \vspace{-1.20cm}
    \tableofcontents
\end{frame}

\include{Objective}
\include{References}

\end{document}

References:

\begin{frame}{References}
\vspace{-0.50cm}
\begin{minipage}{1\linewidth}
\bibliographystyle{unsrt}
\bibliography{biblio}
\end{minipage}
\end{frame}

Output:

Does anyone knows why the reference is not appearing as a number?

My bib entry is:

@misc{Guide,
 author               = {Guide},
 howpublished         = {Guide},
 title                = {The Guide},
 year                 = {2014},
}

Answer 1

You need to place

\setbeamertemplate{bibliography item}[text]

before \bibliographystyle.

The purpose of these icons, quoted from the beamer documentation:

Unlike normal LaTeX, the default template for the bibliography does not repeat the citation text (like “[Dijkstra, 1982]”) before each item in the bibliography. Instead, a cute, small article symbol is drawn. The rationale is that the audience will not be able to remember any abbreviated citation texts till the end of the talk.

There's a nice overview of the different icons at another question.