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MLA

Willett, Joseph W, et al. "Area Sampling Frames for Agriculture In Developing Countries." ,

APA

Willett, J. W, United States, U. States, Department of Agriculture, D. of Agriculture, & Statistical Reporting Service, S. Reporting Service. (1981). Area sampling frames for agriculture in developing countries.

Chicago

Willett, Joseph W., United States, Department of Agriculture, and Statistical Reporting Service. "Area sampling frames for agriculture in developing countries" (1981):