The National Wildlife Refuge System Administration Act of 1966 provided guidelines and directives for administration and management of all areas in National Wildlife Refuge system including "wildlife refuges, areas for the protection and conservation of fish and wildlife that are threatened with extinction, wildlife ranges, game ranges, wildlife management areas, and waterfowl production areas."^{[1][non-primary source needed]}

• From US Fish and Wildlife Service National Wildlife Refuge Administration Act, or
• From Cornell Law's US Code Collection National Wildlife Refuge Administration Act

• From NOAA Coastal Services Center [1]
• Fischman, Robert, "The Significance of National Wildlife Refuges in the Development of U.S. Conservation Policy" . Journal of Land Use & Environmental Law, Vol. 21, p. 1, Fall 2005. SSRN 699482