Coba jelasin HTL-2 dari Bell 47 dalam bahasa melayu dong

Model 47G specs from The International Directory of Civil Aircraft by Gerard Frawley

Mutza, Wayne. H-13 Sioux Mini in Action. Carrollton, TX: Squadron/Signal Publications, 1995. ISBN 0-89747-329-0

United States, Headquarters Department of the Army, Army Concept Team in Vietnam. Final Report of Essential Load of Scout Helicopters. Saigon, Vietnam: Army Concept Team in Vietnam, 1966