APA (7th ed.) Citation

Harrington, H. D., & Durrell, L. W. (1950). Colorado ferns and fern allies: Pteridophyta. published by Colorado Agricultural Research Foundation at Colorado Agricultural and Mechanical College.

Chicago Style (17th ed.) Citation

Harrington, Harold David, and L. W. Durrell. Colorado Ferns and Fern Allies: Pteridophyta. Fort Collins: published by Colorado Agricultural Research Foundation at Colorado Agricultural and Mechanical College, 1950.

MLA (9th ed.) Citation

Harrington, Harold David, and L. W. Durrell. Colorado Ferns and Fern Allies: Pteridophyta. published by Colorado Agricultural Research Foundation at Colorado Agricultural and Mechanical College, 1950.