APA (7th ed.) Citation

Goodspeed, T. H. (1941). A fourth new species of Nicotiana from Peru. University of California press.

Chicago Style (17th ed.) Citation

Goodspeed, T. H. A Fourth New Species of Nicotiana from Peru. Berkeley, Los Angeles: University of California press, 1941.

MLA (9th ed.) Citation

Goodspeed, T. H. A Fourth New Species of Nicotiana from Peru. University of California press, 1941.