APA (7th ed.) Citation

Zirkle, C. (1935). The beginnings of plant hybridization. University of Pennsylvania Press; H. Milford, Oxford University Press.

Chicago Style (17th ed.) Citation

Zirkle, Conway. The Beginnings of Plant Hybridization. Philadelphia : London: University of Pennsylvania Press; H. Milford, Oxford University Press, 1935.

MLA (9th ed.) Citation

Zirkle, Conway. The Beginnings of Plant Hybridization. University of Pennsylvania Press; H. Milford, Oxford University Press, 1935.