United States. Department of the Army. ARMY AIRFIELD-HELIPORT DESIGN: GENERAL PROVISION AND CRITERIA.
Cita Chicago (17th ed.)United States. Department of the Army. ARMY AIRFIELD-HELIPORT DESIGN: GENERAL PROVISION AND CRITERIA. U.S.G.P., 1965. (T.M. 5-823-1).
Cita MLA (8th ed.)United States. Department of the Army. ARMY AIRFIELD-HELIPORT DESIGN: GENERAL PROVISION AND CRITERIA.
Atenció: Aquestes cites poden no estar 100% correctes.