APA (7th ed.) Citation

Zandvoort, R. W., & Van Ek, J. A. (1975). A handbook of English grammar (7th ed.). Longman.

Chicago Style (17th ed.) Citation

Zandvoort, R. W., and J. A. Van Ek. A Handbook of English Grammar. 7th ed. London: Longman, 1975.

MLA (9th ed.) Citation

Zandvoort, R. W., and J. A. Van Ek. A Handbook of English Grammar. 7th ed. Longman, 1975.