APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.