Performance Research Associates, Zemke, R., & Anderson, K. (2003). Performance Research Associates' Delivering knock your socks off service (3rd ed. revisions.). American Management Association.

Performance Research Associates, Ron Zemke, and Kristin Anderson. Performance Research Associates' Delivering Knock Your Socks off Service. 3rd ed. revisions. New York: American Management Association, 2003.

Performance Research Associates, et al. Performance Research Associates' Delivering Knock Your Socks off Service. 3rd ed. revisions. American Management Association, 2003.