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