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MLA

Richards, B.L, and H.L Blood. "Psyllid Yellows of the Potato." , 189-216.. Print

APA

Richards, B., & Blood, H. (0000). Psyllid Yellows of the Potato.

Chicago

Richards, B.L., and H.L Blood. "Psyllid Yellows of the Potato" (1933): 189-216..