, (2012). Rainfall Levels and their Impact on Wheat Productivity:. kirkuk university journal for scientific studies, 34(107), 161-170.
. "Rainfall Levels and their Impact on Wheat Productivity:". kirkuk university journal for scientific studies, 34, 107, 2012, 161-170.
, (2012). 'Rainfall Levels and their Impact on Wheat Productivity:', kirkuk university journal for scientific studies, 34(107), pp. 161-170.
, Rainfall Levels and their Impact on Wheat Productivity:. kirkuk university journal for scientific studies, 2012; 34(107): 161-170.