APA (7th ed.) Citation

Goodspeed, T. H. (1953). Species origins and relationships in the genus Nicotiana. University of California Press.

Chicago Style (17th ed.) Citation

Goodspeed, T. H. Species Origins and Relationships in the Genus Nicotiana. Berkeley: University of California Press, 1953.

MLA (9th ed.) Citation

Goodspeed, T. H. Species Origins and Relationships in the Genus Nicotiana. University of California Press, 1953.