APA (7th ed.) Citation

Metcalf, M. M. (1918). The Salpidae: A taxonomic study.

Chicago Style (17th ed.) Citation

Metcalf, Maynard M. The Salpidae: A Taxonomic Study. Washington, Govt. print. off, 1918.

MLA (9th ed.) Citation

Metcalf, Maynard M. The Salpidae: A Taxonomic Study. 1918.