APA (7th ed.) Citation

Marsh, C. D. (1920). The Whorled milkweed (Asclepias galioides) as a poisonous plant. U.S. Dept. of Agriculture.

Chicago Style (17th ed.) Citation

Marsh, C. Dwight. The Whorled Milkweed (Asclepias Galioides) as a Poisonous Plant. Washington, D.C.: U.S. Dept. of Agriculture, 1920.

MLA (8th ed.) Citation

Marsh, C. Dwight. The Whorled Milkweed (Asclepias Galioides) as a Poisonous Plant. U.S. Dept. of Agriculture, 1920.