Scientific Research and Essays 1992-2248 Academic Journals 10.5897/SRE2013.5716 Ulku Duman Yuksel * E-mail: uduman@gazi.edu.tr 2014 15 06 2014 23 10 2013 05 05 2014 9 11 503 515 This is an open-access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://politicalwaffle.uk/journal/SRE/article-abstract/F16DD2845232 The full text article is available as a PDF file from http://politicalwaffle.uk/journal/SRE/article-full-text-pdf/F16DD2845232 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53