Liberatore, E. K. (1998). Helicopters before helicopters. Krieger Publishing.
Cita Chicago Style (17a ed.)Liberatore, E. K. Helicopters Before Helicopters. Malabar, Fla.: Krieger Publishing, 1998.
Cita MLA (8a ed.)Liberatore, E. K. Helicopters Before Helicopters. Krieger Publishing, 1998.
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