1. Helicopter Sizing by Statistics
2. ProutyR. W., Helicopter Performance, Stability, and Control, Krieger, Malabar, FL, 1995, pp. 663–665.
3. Preliminary Design of Transport Helicopters
4. JohnsonW. “NDARC NASA Design and Analysis of Rotorcraft,” NASA Ames Research Center, TR TP-2009-215402, Moffett Field, CA, 2009.