APA (7th ed.) Citation

Summers, D. (1992). Longman dictionary of contemporary English (New ed.). Longman.

Chicago Style (17th ed.) Citation

Summers, Della. Longman Dictionary of Contemporary English. New ed. Harlow: Longman, 1992.

MLA (9th ed.) Citation

Summers, Della. Longman Dictionary of Contemporary English. New ed. Longman, 1992.