APA (7th ed.) Citation

Longman & Longman. (1990). Introducing Great Britain. Longman Group.

Chicago Style (17th ed.) Citation

Longman and Longman. Introducing Great Britain. [England]: Longman Group, 1990.

MLA (8th ed.) Citation

Longman and Longman. Introducing Great Britain. Longman Group, 1990.

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