AirVectors. “The Boeing Sea Knight,” accessed  December 12, 2013.

AirVectors. “The Boeing Chinook,” accessed October 18, 2013.

Aviastar. “Sikorsky S-64 / CH-54 ‘Tarhe,’” accessed September 10, 2018.

“CH-47 Chinook in Vietnam War - A Day in the Life of a Helicopter Pilot (1967), U.S. Army,” Wikimedia Commons video.,_U.S._Army.webm

Lepore, Herbert P. “The Coming of Age: The Role of the Helicopter in the Vietnam War.” Army History, No. 29 (Winter 1994): 29-36.

Lessing, Lawrence P. “Helicopters.” Scientific American Vol. 192, No. 1 (January 1955): 36-41.

Military Factory. Sikorsky “H-34 / CH-34 Choctaw,” accessed December 2, 2018.

National Museum of the US Air Force. “Kaman HH-43B Huskie,” last modified May 18, 2015.

Olive-Drab. “Bell H-13 Sioux Helicopter,” accessed September 10, 2018.

Olive-Drab. “CH-3 Jolly Green Giant Helicopter,” accessed December 2, 2018.

Sotham, John. “Huey.” Air & Space Magazine (May 2000).

Shoreline Aviation. “Piston Engine Aircraft vs. Turboprop Engine Aircraft,” last modified December 12, 2011.

Strategic Air Command & Aerospace Museum. “CH-21B ‘Work Horse,’” accessed September 10, 2018.

Vietnam Center and Archive. “Vietnam: The Helicopter War,” accessed September 10, 2018.

Vietnam Helicopter Museum. “AH-1F Modernized ‘Cobra’ Helicopter, ‘Virginia Rose II,’” last modified July 11, 2016.

“Vietnam helicopter pilots describe the war from the cockpit,” YouTube video, posted by “Military Times,” April 18th, 2018.