APA (7th ed.) Zitazioa

English Language Services & English language services. (1964). English 900.: Book three. Macmillan.

Chicago Style (17th ed.) Zitazioa

English Language Services eta English language services. English 900.: Book Three. London: Macmillan, 1964.

MLA (9th ed.) Zitazioa

English Language Services eta English language services. English 900.: Book Three. Macmillan, 1964.