APA (7th ed.) Citation

Broun, M. (1938). Index to North American ferns.: Constituting a catalogue of the ferns and fern allies of North America north of Mexico, including all known forms, varieties, and hybrids. Pub. by the Compiler.

Chicago Style (17th ed.) Citation

Broun, Maurice. Index to North American Ferns.: Constituting a Catalogue of the Ferns and Fern Allies of North America North of Mexico, Including All Known Forms, Varieties, and Hybrids. Orleans, Mass.: Pub. by the Compiler, 1938.

MLA (9th ed.) Citation

Broun, Maurice. Index to North American Ferns.: Constituting a Catalogue of the Ferns and Fern Allies of North America North of Mexico, Including All Known Forms, Varieties, and Hybrids. Pub. by the Compiler, 1938.