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MLA

Wigton, William H, et al. "World Food Survey." ,

APA

Wigton, W. H, United States, U. States, Department of Agriculture, D. of Agriculture, & Statistical Reporting Service, S. Reporting Service. (1977). World food survey.

Chicago

Wigton, William H., United States, Department of Agriculture, and Statistical Reporting Service. "World food survey" (1977):