(1999). 1997 census of agriculture. [Washington, D.C.]: U.S. Dept. of Agriculture, National Agricultural Statistics Services.
Stile di citazione Chicago1997 Census of Agriculture. [Washington, D.C.]: U.S. Dept. of Agriculture, National Agricultural Statistics Services, 1999.
Citazione MLA1997 Census of Agriculture. [Washington, D.C.]: U.S. Dept. of Agriculture, National Agricultural Statistics Services, 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.