Citazione Stile APA (7a Edizione)

Stebbins, G. L., Jr. (1967). Variation and Evolution in Plants (6th ptg.). Columbia University Press.

Citazione stile Chigago Style (17a edizione)

Stebbins, G. Ledyard, Jr. Variation and Evolution in Plants. 6th ptg. New York: Columbia University Press, 1967.

Citatione MLA (9a ed.)

Stebbins, G. Ledyard, Jr. Variation and Evolution in Plants. 6th ptg. Columbia University Press, 1967.