APA (7th ed.) Citation

Shigo, A. L. (1983). Tree defects: A photo guide. Northeastern Forest Experiment Station.

Chicago Style (17th ed.) Citation

Shigo, Alex L. Tree Defects: A Photo Guide. Radno, Pa: Northeastern Forest Experiment Station, 1983.

MLA (9th ed.) Citation

Shigo, Alex L. Tree Defects: A Photo Guide. Northeastern Forest Experiment Station, 1983.

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