APA (7th ed.) Citation

Harshberger, J. W. (1920). Vegetation of North America. Rand McNally.

Chicago Style (17th ed.) Citation

Harshberger, John William. Vegetation of North America. Chicago u.a: Rand McNally, 1920.

MLA (9th ed.) Citation

Harshberger, John William. Vegetation of North America. Rand McNally, 1920.