APA (7th ed.) Citation

Clapp, V. W. (1979). Alaska's spruce (rev. ed.).

Chicago Style (17th ed.) Citation

Clapp, Verner W. Alaska's Spruce. rev. ed. Washington, D.C, 1979.

MLA (9th ed.) Citation

Clapp, Verner W. Alaska's Spruce. rev. ed. 1979.