Cita APA (7a ed.)

(1964). English 900: Workbook prepared by English language services. Collier-Macmillan.

Cita Chicago Style (17a ed.)

English 900: Workbook Prepared by English Language Services. London: Collier-Macmillan, 1964.

Cita MLA (8a ed.)

English 900: Workbook Prepared by English Language Services. Collier-Macmillan, 1964.