APA (7th ed.) Citation

Longman & Longman. (1987). London. Longman Group.

Chicago Style (17th ed.) Citation

Longman and Longman. London. [England]: Longman Group, 1987.

MLA (8th ed.) Citation

Longman and Longman. London. Longman Group, 1987.

Warning: These citations may not always be 100% accurate.