\documentclass[a4paper,12pt,twoside]{article}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amscd}
\usepackage[latin5]{inputenc}
\textwidth 15cm
\oddsidemargin 0cm
\evensidemargin 0.5cm
\parindent 0cm
\newcommand{\vbos}{\rule{0pt}{2ex}}
\usepackage{fancyhdr}
\addtolength{\textheight}{2cm}
\addtolength{\topmargin}{-0.75cm}
\DeclareMathOperator{\mydiv}{div}
\renewcommand\refname{References/Kaynaklar}

\begin{document}
\begin{center}
\begin{Large}
  \textbf{Title}
\end{Large}

%Below only speaker's information should be written. If any, the names of coauthors should be mentioned later.
\vspace{0.5cm}
Name Surname

\vspace{0.5cm}
\begin{small}
Institution, City, Country\\
\texttt{e-mail}
\end{small}
\end{center}

\vspace{0.3cm}
Abstract text.


\vspace{0.2cm}
%Only the first letter of the first keyword should be capitalized.
\begin{small}
\textbf{Keywords.} Keyword1, keyword2, ....
\end{small}

%If there are coauthors they should be mentioned here.
\vspace{0.2cm}
\begin{small}
This is a joint work with ..., ... and ....
\end{small}

\vspace{1cm}

\begin{center}
\begin{Large}
  \textbf{Başlık}
\end{Large}

%Below only speaker's information should be written. If any, the names of coauthors should be mentioned later.
\vspace{0.5cm}
İsim Soyisim

\vspace{0.5cm}
\begin{small}
Kurum, Şehir, Ülke\\
\texttt{e-mail}
\end{small}
\end{center}

\vspace{0.3cm}
Özet metni.


\vspace{0.2cm}
%Only the first letter of the first keyword should be capitalized.
\begin{small}
\textbf{Anahtar Kelimeler.} Anahtar kelime1, anahtar kelime2, ....
\end{small}

%If there are coauthors they should be mentioned here.
\vspace{0.2cm}
\begin{small}
..., ... ve .... ile ortak çalışmadır.
\end{small}

%Buraya özet metninde geçen referansları yazabilirsiniz. Metinde geçmeyen kaynaklar yazılmamalı ve kaynak sayısı en fazla 5 olmalıdır.
\begin{small}
\begin{thebibliography}{10}
\bibitem{paper1}
A.A. Aaaaa,  \textsl{Book Title}, Publisher, City/Country Year.
\bibitem{paper2}
A. Aaaaa, B.B. Bbbbbb, C. Ccccc and D. Ddddd, Article title, \textsl{Journal Title} \textbf{Volume Number} (Year), start page number--end page number.
\end{thebibliography}
\end{small} 
\end{document}