APA (7th ed.) Citation

Rádl, E., & Hatfield, E. J. (1930). The history of biological theories. H. Milford, Oxford university press.

Chicago Style (17th ed.) Citation

Rádl, Emanuel, and E. J. Hatfield. The History of Biological Theories. London: H. Milford, Oxford university press, 1930.

MLA (9th ed.) Citation

Rádl, Emanuel, and E. J. Hatfield. The History of Biological Theories. H. Milford, Oxford university press, 1930.