APA-referens

(1981). World English: Workbook. Washington, DC.: United states Department of state.

Chicago-stil citat

World English: Workbook. Washington, DC.: United states Department of state, 1981.

MLA-referens

World English: Workbook. Washington, DC.: United states Department of state, 1981.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.