Citazione Stile APA (7a Edizione)
(1991). Agriculture and the Environment: <The> 1991 Yearbook of Agriculture (1. ed.). U.S. Government Printing Office.
Citazione stile Chigago Style (17a edizione)
Agriculture and the Environment: <The> 1991 Yearbook of Agriculture. 1. ed. Washington: U.S. Government Printing Office, 1991.
Citatione MLA (9a ed.)
Agriculture and the Environment: <The> 1991 Yearbook of Agriculture. 1. ed. U.S. Government Printing Office, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.