APA (7th ed.) Citation

Hall, H. M., & Long, F. L. (1921). Rubber-content of North American plants. Carnegie Institution of Washington.

Chicago Style (17th ed.) Citation

Hall, Harvey Monroe, and Frances Louise Long. Rubber-content of North American Plants. Washington: Carnegie Institution of Washington, 1921.

MLA (9th ed.) Citation

Hall, Harvey Monroe, and Frances Louise Long. Rubber-content of North American Plants. Carnegie Institution of Washington, 1921.