APA (7th ed.) Citation

(2008). Ferns of the national forests in Alaska. U.S. Department of Agriculture, Forest Service, Alaska Region.

Chicago Style (17th ed.) Citation

Ferns of the National Forests in Alaska. [Washington, D.C.]: U.S. Department of Agriculture, Forest Service, Alaska Region, 2008.

MLA (9th ed.) Citation

Ferns of the National Forests in Alaska. U.S. Department of Agriculture, Forest Service, Alaska Region, 2008.