APA (7th ed.) Citation

Collingwood, G. H., & Brush, W. D. (1947). Knowing your trees (51 tree ed.). American Forestry Association.

Chicago Style (17th ed.) Citation

Collingwood, G. H., and Warren David Brush. Knowing Your Trees. 51 tree ed. Washington, D.C.: American Forestry Association, 1947.

MLA (9th ed.) Citation

Collingwood, G. H., and Warren David Brush. Knowing Your Trees. 51 tree ed. American Forestry Association, 1947.