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MLA

Tharp, W. H. (William Hardy). "The Cotton Plant : How it Grows and Why Its Growth Varies / by W.h. Tharp." , p.. Print

APA

Tharp, W. H. (William Hardy). (1960). The cotton plant : how it grows and why its growth varies / by W.H. Tharp.

Chicago

Tharp, W. H. (William Hardy) "The cotton plant : how it grows and why its growth varies / by W.H. Tharp" (0000): p..