MLA

Pines, Malcolm, and Jeff Roberts. The Practice of Group Analysis. London: Routledge & Kegen Paul, 1991.

APA

Pines, M., & Roberts, J. (1991). The practice of group analysis. London: Routledge & Kegen Paul.

Chicago

Pines, Malcolm, ed., and Jeff Roberts ed. The Practice of Group Analysis. London: Routledge & Kegen Paul, 1991.