Tolong jelaskan mengenai Bibliografi dari Sikorsky S-52

FAA Type Data Certificate, Helicopter Specification No. 1H2, rev. 3; 7 July 1961.

GAA Rotorcraft Flight Manual for Model S-52-3 Helicopter, Publication No. SA4045-10 Register 2, Sikorsky Aircraft Division of United Aircraft, 1952.

Donald, David, ed. "Sikorsky S-52". Encyclopedia of World Aircraft. Etobicoke, Ontario: Prospero Books, 1997. ISBN 1-85605-375-X.

Harding, Stephen. "Sikorsky H-28". U.S. Army Aircraft Since 1947. Shrewsbury, England: Airlife, 1990. ISBN 1-85310-102-8.

Polmar, Norman, and Floyd D. Kennedy, Jr. Military Helicopters of the World. Annapolis, MD: Naval Institute Press, 1981. ISBN 0870213830.