APA (7th ed.) Citation

Tharp, W. H. (1960). The cotton plant: How it grows and why its growth varies. U.S. Dep. of Agriculture.

Chicago Style (17th ed.) Citation

Tharp, W. H. The Cotton Plant: How It Grows and Why Its Growth Varies. Washington, DC: U.S. Dep. of Agriculture, 1960.

MLA (9th ed.) Citation

Tharp, W. H. The Cotton Plant: How It Grows and Why Its Growth Varies. U.S. Dep. of Agriculture, 1960.