APA (7th ed.) Citation

Shigo, A. L. (1979). Tree decay: An expanded concept. Dept. of Agriculture, Forest Service.

Chicago Style (17th ed.) Citation

Shigo, Alex L. Tree Decay: An Expanded Concept. [Washington]: Dept. of Agriculture, Forest Service, 1979.

MLA (9th ed.) Citation

Shigo, Alex L. Tree Decay: An Expanded Concept. Dept. of Agriculture, Forest Service, 1979.

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