1659-4266 1659-4266 S1659-42662018000100102 10.22458/urj.v10i1.2008 Nigeria Nigeria Nigeria 00 06 2018 00 06 2018 10 1 102 109

2011 10 1 1 133 2010 242 263-9 2016 3 5 5 27-35 2015 6 22-38 2008 19 25 25 55-102 2009 32 2 2 373-81 2009 5 16 16 1897-910 2011 104 145-52 2010 116 577-89 2005 88 412-9 2013 5 789-96 2015 3 48 2014 38 31-9 2013 62 16-22 2013 1 1 1 5-15 2013 131 2 2 537-47 2012 749 60-9 2013 27 305-13 2015 7 8931-8 2015 2010 145 76-90 2011 726 2 2 129-35 2008 20 575-83 2011 5 179-259 2003 37 356-69 2013 11 423-30 National Research Council 2011 8th Ed 491-5 2010 30 162-8 2001 113 81-7 2009 55 1 1 95-102 2012 125-33 2009 3 2 2 109-38 1975 72 11 11 4425-9 1983 115 1 1 1-72 2008 60 391-6