Buttrick, R. (2000). Project workout: A tool kit for reaping the rewards from all your business (2nd ed.). Pearson Education Ltd.
Trích dẫn kiểu ChicagoButtrick, Robert. Project Workout: A Tool Kit for Reaping the Rewards from All Your Business. 2nd ed. London: Pearson Education Ltd, 2000.
Trích dẫn MLAButtrick, Robert. Project Workout: A Tool Kit for Reaping the Rewards from All Your Business. 2nd ed. Pearson Education Ltd, 2000.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.