English Language Services & English language services. (1964). English 900.: Book three. Macmillan.
Citazione stile Chigago Style (17a edizione)English Language Services e English language services. English 900.: Book Three. London: Macmillan, 1964.
Citatione MLA (9a ed.)English Language Services e English language services. English 900.: Book Three. Macmillan, 1964.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.