\begin{thebibliography}{99} % assumes less than 100 references
%\addcontentsline{toc}{section}{مراجع} % to add the references to index
%چنانچه مرجع فارسی نیز داشته باشید باید دستور فوق را فعال کنید و مراجع فارسی خود را بعد از این دستور وارد کنید
%\Persian
%\bibitem{ali}
%علی روستایی، مسعود پورموسی و فرشاد عبداللّه‌نیا \emph{کارگاه آموزشی زی‌پرشین}، دانشکده مهندسی مکانیک، دانشگاه صنعتی شریف، زمستان ۱۳۸۸
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%*************************references: chapters 1********************
\bibitem{ref1}
T. Vicsek, \textit{Fractal growth phenomena}, 2nd ed. (World scientific, Singapore, 1992).
\bibitem{ref2}
F. Hausdorff photo, Retrieved from\url{http://former.him.uni-bonn.de/Junior-HTP} in 2013; 
A. S. Besicovitch photo, Retrieved from\url{http://www.npg.org.uk/collections/search/portrait/mw215995/‬Abram-Samoilovitch-Besicovitch} in 2013; 
B. Mandelbrot photo, Retrieved from\url{http://users.math.yale.edu/mandelbrot/} in 2013;
\bibitem{ref3}
How Long is the Coastline of Britain?, Retrieved from \url{http://computationallegalstudies.com/2010/10/18/how-long-is-
the-coastline-of-the-law-additional-thoughts-on-the-fractal-nature-of-legal-systems/} in 2013.
\bibitem{ref4}
V. ghobadiyan, \textit{Concepts and principles in contemporary architecture in West }, (Office of Cultural Research, Iran, 2007).
\bibitem{ref5}
Fractals: Order in Chaos, Retrieved from \url{http://www.cwu.edu/~ratlifja/Fractals.html} in 2013; A Diverse Collection of Fractals in Nature, Retrieved from \url{http://www.icftw.com/2011/02/03/a-diverse-collection-of-fractals-in-nature/} in 2013; Fractal, Retrieved from \url{http://en.wikipedia.org/wiki/Fractal} in 2013.
Dynamics, Chaos, Fractals, Retrieved from \url{http://www.science4all.org/scottmckinney/dynamics-chaos-and-fractals-pt-1/} in 2013; Snowflakes, Retrieved from \url{http://distractify.com/geek/science/the-most-fascinating-fractals-found-in-nature/} in 2013; Patterns in Nature, Retrieved from \url{http://richworks.in/2011/02/patterns-in-nature-an-enigmatic-inspiration/} in 2013.