APA (7th ed.) Citation

English Language Services. (1968). A practical English grammar programmed workbook. Collier-Macmillan International.

Chicago Style (17th ed.) Citation

English Language Services. A Practical English Grammar Programmed Workbook. New York: Collier-Macmillan International, 1968.

MLA (9th ed.) Citation

English Language Services. A Practical English Grammar Programmed Workbook. Collier-Macmillan International, 1968.