Nallathambi, Kannan, and Saravanan K. “Heterosis and Combining Ability Analysis in Tetraploid Cotton (G. Hirsutumand and G. Barbadense L.)”. Electronic Journal of Plant Breeding 7, no. 2 (September 24, 2016): 341-351. Accessed April 21, 2021. http://www.ejplantbreeding.org/index.php/EJPB/article/view/800.