A. Brito da Cunha; Th. Dobzhansky; O. Pavlovsky; B. Spassky (September 1959). "Genetics of Natural Populations. XXVIII. Supplementary Data on the Chromosomal Polymorphism in Drosophila willistoni in its Relation to the Environment". Evolution. 13 (3). Society for the Study of Evolution: 389–404. doi:10.2307/2406115. JSTOR2406115.
A. Brito da Cunha; Th. Dobzhansky; O. Pavlovsky; B. Spassky (September 1959). "Genetics of Natural Populations. XXVIII. Supplementary Data on the Chromosomal Polymorphism in Drosophila willistoni in its Relation to the Environment". Evolution. 13 (3). Society for the Study of Evolution: 389–404. doi:10.2307/2406115. JSTOR2406115.