United States. Forest Pest Management, Hamm, P. B., Campbell, S. J., & Hansen, E. M. (1990). Growing healthy seedlings: Identification and management of pests in Northwest forest nurseries. Forest Pest Management, U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Region : Forest Research Laboratory, College of Forestry, Oregon State University.
Chicago Style (17th ed.) CitationUnited States. Forest Pest Management, Philip B. Hamm, Sally J. Campbell, and Everett M. Hansen. Growing Healthy Seedlings: Identification and Management of Pests in Northwest Forest Nurseries. [Portland, Or.]: Forest Pest Management, U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Region : Forest Research Laboratory, College of Forestry, Oregon State University, 1990.
MLA (9th ed.) CitationUnited States. Forest Pest Management, et al. Growing Healthy Seedlings: Identification and Management of Pests in Northwest Forest Nurseries. Forest Pest Management, U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Region : Forest Research Laboratory, College of Forestry, Oregon State University, 1990.