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MLA

McChesney, J.D, M.A Wallig, and G Cragg. "Plants and Plant Products As Sources of Pharmaceuticals." , 134-141.. Print

APA

McChesney, J., Wallig, M., & Cragg, G. (0000). Plants and plant products as sources of pharmaceuticals.

Chicago

McChesney, J.D., M.A Wallig, and G Cragg. "Plants and plant products as sources of pharmaceuticals" (1992): 134-141..