Cochran, P. H., & Barrett, J. W. (1999). Thirty-five-year growth of ponderosa pine saplings in response to thinning and understory removal. U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station.
Chicago Style (17th ed.) CitationCochran, P. H., and James W. Barrett. Thirty-five-year Growth of Ponderosa Pine Saplings in Response to Thinning and Understory Removal. Portland, Or. (333 S.W. First Ave., P.O. Box 3890, Portland 97208-3890): U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 1999.
MLA (9th ed.) CitationCochran, P. H., and James W. Barrett. Thirty-five-year Growth of Ponderosa Pine Saplings in Response to Thinning and Understory Removal. U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 1999.