APA (7th ed.) Citation

Kell, P., Shore, S., & Singh, M. (2004). Adult education @ 21st century. P. Lang.

Chicago Style (17th ed.) Citation

Kell, Peter, Sue Shore, and Michael Singh. Adult Education @ 21st Century. New York: P. Lang, 2004.

MLA (9th ed.) Citation

Kell, Peter, et al. Adult Education @ 21st Century. P. Lang, 2004.