APA (7th ed.) Citation

Shigo, A. L. (1989). Tree pruning: A worldwide photo guide. Shigo & Trees.

Chicago Style (17th ed.) Citation

Shigo, Alex L. Tree Pruning: A Worldwide Photo Guide. Durham, NH: Shigo & Trees, 1989.

MLA (9th ed.) Citation

Shigo, Alex L. Tree Pruning: A Worldwide Photo Guide. Shigo & Trees, 1989.

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