Cita APA (7th ed.)
English Language Services & English language services. (1964). English 900.: Book three. Macmillan.
Cita Chicago (17th ed.)
English Language Services i English language services. English 900.: Book Three. London: Macmillan, 1964.
Cita MLA (9th ed.)
English Language Services i English language services. English 900.: Book Three. Macmillan, 1964.
Atenció: Aquestes cites poden no estar 100% correctes.