APA (7th ed.) Citation

Zandvoort, R. W., & Ek, J. A. v. (1975). A handbook of english grammar (7a. ed.). Longman.

Chicago Style (17th ed.) Citation

Zandvoort, R. W., and J. A. van Ek. A Handbook of English Grammar. 7a. ed. Londres: Longman, 1975.

MLA (9th ed.) Citation

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