APA (7th ed.) Citation

Summers, D. (1987). Longman dictionary of contemporary English (New ed.). Longman.

Chicago Style (17th ed.) Citation

Summers, Della. Longman Dictionary of Contemporary English. New ed. Harlow, Essex, England: Longman, 1987.

MLA (8th ed.) Citation

Summers, Della. Longman Dictionary of Contemporary English. New ed. Longman, 1987.