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MLA

Block, C. C, et al. "Evaluation of Wild Helianthus Species for Resistance to Sclerotina Stalk Rot." ,

APA

Block, C. C, Gulya, T. J, Marek, L. F, United States, U. States, & Department of Agriculture, D. of Agriculture. (1974). Evaluation of wild Helianthus species for resistance to Sclerotina stalk rot.

Chicago

Block, C. C., Thomas J Gulya, L. F Marek, United States, and Department of Agriculture. "Evaluation of wild Helianthus species for resistance to Sclerotina stalk rot" (1974):