Buttrick, R. (1997). The project workout: A tool kit for reaping the rewards from all your business projects. Pitman.
Chicago-referens (17:e uppl.)Buttrick, Robert. The Project Workout: A Tool Kit for Reaping the Rewards from All Your Business Projects. London: Pitman, 1997.
MLA-referens (9:e uppl.)Buttrick, Robert. The Project Workout: A Tool Kit for Reaping the Rewards from All Your Business Projects. Pitman, 1997.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.