APA (7th ed.) Citation

Vernon, H. M. (1903). Variations in animals and plants. H. Holt.

Chicago Style (17th ed.) Citation

Vernon, Horace Middleton. Variations in Animals and Plants. New York: H. Holt, 1903.

MLA (9th ed.) Citation

Vernon, Horace Middleton. Variations in Animals and Plants. H. Holt, 1903.

Warning: These citations may not always be 100% accurate.