United States Information Service. (1975). An outline of American geography. United States Information Agency.
Citazione stile Chigago Style (17a edizione)United States Information Service. An Outline of American Geography. Nueva York: United States Information Agency, 1975.
Citatione MLA (9a ed.)United States Information Service. An Outline of American Geography. United States Information Agency, 1975.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.