Citazione Stile APA (7a Edizione)
(1968). U.S. Exports: Country by commodity groupings. U.S. Government Printing Office.
Citazione stile Chigago Style (17a edizione)
U.S. Exports: Country by Commodity Groupings. Washington: U.S. Government Printing Office, 1968.
Citatione MLA (9a ed.)
U.S. Exports: Country by Commodity Groupings. U.S. Government Printing Office, 1968.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.