Buttrick, R. (1997). The project workout: A tool kit for reaping the rewards from all your business projects. Pitman.
Παραπομπή σε μορφή Chicago (17η εκδ.)Buttrick, Robert. The Project Workout: A Tool Kit for Reaping the Rewards from All Your Business Projects. London: Pitman, 1997.
Παραπομπή σε μορφή MLA (9th εκδ.)Buttrick, Robert. The Project Workout: A Tool Kit for Reaping the Rewards from All Your Business Projects. Pitman, 1997.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.