S. A. Al-Saffar, R., and Z. K. H. Al-Sawaf. “Estimation of Heterosis and Heritability in Bread Wheat (Triticum Aestivum L.)”. Rafidain Journal of Science, vol. 23, no. 6, Sept. 2012, pp. 27-38, doi:10.33899/rjs.2012.59603.