APA (7th ed.) Citation

United States. National Park Service. (1991). Big Thicket National Preserve, Texas: Official map and guide ([1991 revised edition].). Forest Service.

Chicago Style (17th ed.) Citation

United States. National Park Service. Big Thicket National Preserve, Texas: Official Map and Guide. [1991 revised edition]. [Washington, D.C.]: Forest Service, 1991.

MLA (9th ed.) Citation

United States. National Park Service. Big Thicket National Preserve, Texas: Official Map and Guide. [1991 revised edition]. Forest Service, 1991.