Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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