Citazione APA

(1999). 1997 census of agriculture. [Washington, D.C.]: U.S. Dept. of Agriculture, National Agricultural Statistics Services.

Stile di citazione Chicago

1997 Census of Agriculture. [Washington, D.C.]: U.S. Dept. of Agriculture, National Agricultural Statistics Services, 1999.

Citazione MLA

1997 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%.