Citazione APA

(1982). World English: Teacher's book. Washington, DC.: United states Department of state.

Stile di citazione Chicago

World English: Teacher's Book. Washington, DC.: United states Department of state, 1982.

Citazione MLA

World English: Teacher's Book. Washington, DC.: United states Department of state, 1982.

Attenzione: Queste citazioni potrebbero non essere precise al 100%.