APA (7th ed.) Citation

Parsons, F. T., Smith, A. J., & Satterlee, M. (2013). How to Know the Ferns A Guide to the Names, Haunts and Habitats of Our Common Ferns. Project Gutenberg.

Chicago Style (17th ed.) Citation

Parsons, Frances Theodora, Alice Josephine Smith, and Marion Satterlee. How to Know the Ferns A Guide to the Names, Haunts and Habitats of Our Common Ferns. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Parsons, Frances Theodora, et al. How to Know the Ferns A Guide to the Names, Haunts and Habitats of Our Common Ferns. Project Gutenberg, 2013.

Warning: These citations may not always be 100% accurate.