APA (7th ed.) Citation

U.S. Fish and Wildlife Service. National Wildlife Refuge System: A visitor's guide.

Chicago Style (17th ed.) Citation

U.S. Fish and Wildlife Service. National Wildlife Refuge System: A Visitor's Guide.

MLA (9th ed.) Citation

U.S. Fish and Wildlife Service. National Wildlife Refuge System: A Visitor's Guide.

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