Aviation History: The World's First Turboprop - Hartzell Propeller
Twin Engine Turboprops - FLYING Magazine
The New Daher TBM 940 Turboprop Takes Flight – Robb Report
The CV-22B Osprey tiltrotor aircraft combines vertical takeoff, hover and vertical landing capabilities of a helicopter with the long-range, fuel efficiency and speed characteristics of a turboprop aircraft. (US Air Force photo