APA (7th ed.) Citation

Downing, A., & Locke, P. (1995). A university course in English grammar. Phoenix Elt.

Chicago Style (17th ed.) Citation

Downing, Angela, and Philip Locke. A University Course in English Grammar. New York: Phoenix Elt, 1995.

MLA (9th ed.) Citation

Downing, Angela, and Philip Locke. A University Course in English Grammar. Phoenix Elt, 1995.