USDA-Forest Service & Schopmeyer, C. S. (1974). Seeds of woody plants in the United States. USDA.
Chicago Style (17th ed.) CitationUSDA-Forest Service and C. S. Schopmeyer. Seeds of Woody Plants in the United States. Washington, D.C.: USDA, 1974.
MLA (9th ed.) CitationUSDA-Forest Service and C. S. Schopmeyer. Seeds of Woody Plants in the United States. USDA, 1974.