Scientific Research and Essays 1992-2248 Academic Journals 10.5897/SRE2016.6381 Osama M. Rababah Ahmad K. Hwaitat Dana A. Al Qudah * E-mail: o.Rababah@ju.edu.jo 2016 30 04 2016 08 01 2016 14 04 2016 11 8 90 96 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/2DFDF3858431 The full text article is available as a PDF file from http://politicalwaffle.uk/journal/SRE/article-full-text-pdf/2DFDF3858431 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18