APA (7th ed.) Citation

United States. Forest Service. (1981). How to differentiate Dutch elm disease from elm phloem necrosis. U.S. Dept. of Agriculture, Forest Service.

Chicago Style (17th ed.) Citation

United States. Forest Service. How to Differentiate Dutch Elm Disease from Elm Phloem Necrosis. Broomall, PA: U.S. Dept. of Agriculture, Forest Service, 1981.

MLA (9th ed.) Citation

United States. Forest Service. How to Differentiate Dutch Elm Disease from Elm Phloem Necrosis. U.S. Dept. of Agriculture, Forest Service, 1981.