Peterson, G. W., & Smith, R. S. (1975). Forest nursery diseases in the United States. USDA.
Chicago Style (17th ed.) CitationPeterson, Glenn W., and Richard S. Smith. Forest Nursery Diseases in the United States. Washington, D.C.: USDA, 1975.
MLA (9th ed.) CitationPeterson, Glenn W., and Richard S. Smith. Forest Nursery Diseases in the United States. USDA, 1975.