APA (7th ed.) Citation

Thorpe, M., & Grugeon, D. (1987). Open learning for adults. Longman.

Chicago Style (17th ed.) Citation

Thorpe, Mary, and David Grugeon. Open Learning for Adults. [London]: Longman, 1987.

MLA (9th ed.) Citation

Thorpe, Mary, and David Grugeon. Open Learning for Adults. Longman, 1987.