& et al., Al-Amery. “GENETIC ANALYSIS OF COMBINING ABILITY AND GENE ACTION FOR DOUBLE CROSS HYBRIDS IN MAIZE USING RAWLINGS AND COCKERHAM METHOD”. IRAQI JOURNAL OF AGRICULTURAL SCIENCES 47, no. 6 (December 25, 2016). Accessed August 6, 2020. http://jcoagri.uobaghdad.edu.iq/index.php/intro/article/view/473.