Gaya APA

Clack, G., Hug, K, E. (1981). Garis besar ekonomi Amerika Serikat . : Office International Information Program US Departemen of State.

Gaya MLA

Clack, George., Hug, Kathleen, E.. "Garis besar ekonomi Amerika Serikat". : Office International Information Program US Departemen of State, 1981. Text.