Cummings, J., & Ancona, D. (2005). Functional perspective. In S. Wheelan (Ed.), Handbook of group research and practice (pp. 107–117). Sage Publications.

Cummings, J., and D. Ancona. “Functional perspective.” In Handbook of Group Research and Practice, edited by S. Wheelan, 107–17. Sage Publications, 2005.

Cummings J, Ancona D. Functional perspective. In: Wheelan S, editor. Handbook of group research and practice. Sage Publications; 2005. p. 107–17.

Cummings, J., and D. Ancona. “Functional perspective.” Handbook of Group Research and Practice, edited by S. Wheelan, Sage Publications, 2005, pp. 107–17.

Cummings J, Ancona D. Functional perspective. In: Wheelan S, editor. Handbook of group research and practice. Sage Publications; 2005. p. 107–117.