APA (7th ed.) Citation

Morton, C. (1974). William Roxburgh's fern types. Smithsonian Institution.

Chicago Style (17th ed.) Citation

Morton, C.V. William Roxburgh's Fern Types. Washington, D.C: Smithsonian Institution, 1974.

MLA (9th ed.) Citation

Morton, C.V. William Roxburgh's Fern Types. Smithsonian Institution, 1974.