APA (7th ed.) Citation

Watts, D. (1971). Principles of biogeography: An introduction to the functional mechanisms of ecosystems. McGraw-Hill.

Chicago Style (17th ed.) Citation

Watts, David. Principles of Biogeography: An Introduction to the Functional Mechanisms of Ecosystems. London u.a: McGraw-Hill, 1971.

MLA (9th ed.) Citation

Watts, David. Principles of Biogeography: An Introduction to the Functional Mechanisms of Ecosystems. McGraw-Hill, 1971.