50188, U. D. o. A. W. D. (1977). Agricultural Statistics 1977. Washington D.C : US Government Printing Office.
Citação do estilo Chicago (17ª ed.)50188, US Department of Agriculture. Washington D.C. Agricultural Statistics 1977. Washington D.C : US Government Printing Office, 1977.
Citação MLA (8ª ed.)50188, US Department of Agriculture. Washington D.C. Agricultural Statistics 1977. Washington D.C : US Government Printing Office, 1977.
Citação IICA/CATIE50188, U. D. o. A. W. D. 1977. Agricultural Statistics 1977. Washington D.C : US Government Printing Office.