Rast, E. D., Beaton, J. A., & Sonderman, D. L. (1991). Photographic guide of selected external defect indicators and associated internal defects in yellow-poplar. United States Department of Agriculture, Forest Service, Northeastern Forest Experiment Station.
Chicago Style (17th ed.) CitationRast, Everette D., John A. Beaton, and David L. Sonderman. Photographic Guide of Selected External Defect Indicators and Associated Internal Defects in Yellow-poplar. Radnor, Pennsylvania: United States Department of Agriculture, Forest Service, Northeastern Forest Experiment Station, 1991.
MLA (9th ed.) CitationRast, Everette D., et al. Photographic Guide of Selected External Defect Indicators and Associated Internal Defects in Yellow-poplar. United States Department of Agriculture, Forest Service, Northeastern Forest Experiment Station, 1991.