APA (7th ed.) Citation

Open University, Gearing, B., Johnson, M., & Heller, T. (1988). Mental health problems in old age: A reader. Wiley.

Chicago Style (17th ed.) Citation

Open University, Brian Gearing, Malcolm Johnson, and Tom Heller. Mental Health Problems in Old Age: A Reader. Chichester [England] ; New York: Wiley, 1988.

MLA (9th ed.) Citation

Open University, et al. Mental Health Problems in Old Age: A Reader. Wiley, 1988.