APA (7th ed.) Citation

Procter, P. (1978). Longman dictionary of contemporary English. Longman.

Chicago Style (17th ed.) Citation

Procter, Paul. Longman Dictionary of Contemporary English. Harlow [Eng.]: Longman, 1978.

MLA (8th ed.) Citation

Procter, Paul. Longman Dictionary of Contemporary English. Longman, 1978.