APA (7th ed.) Citation

Croft, K., & Davis, A. L. (1957). A practical course in English for foreign students: Units 1-5. English Language Services.

Chicago Style (17th ed.) Citation

Croft, Kenneth, and A. L. Davis. A Practical Course in English for Foreign Students: Units 1-5. Washington: English Language Services, 1957.

MLA (9th ed.) Citation

Croft, Kenneth, and A. L. Davis. A Practical Course in English for Foreign Students: Units 1-5. English Language Services, 1957.