APA (7th ed.) Citation

United States. Bureau of Plant Industry. (1938). Rubber content and habits of second desert milkweed (Asclepias erosa) of southern California and Arizona. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Plant Industry. Rubber Content and Habits of Second Desert Milkweed (Asclepias Erosa) of Southern California and Arizona. [Washington]: [s.n.], 1938.

MLA (9th ed.) Citation

United States. Bureau of Plant Industry. Rubber Content and Habits of Second Desert Milkweed (Asclepias Erosa) of Southern California and Arizona. [s.n.], 1938.