Cita APA (7th ed.)

McKenna, J. A., & Allen, N. (2010). Skycrane: Igor Sikorsky's last vision. American Institute of Aeronautics and Astronautics.

Cita Chicago (17th ed.)

McKenna, John A., i Ned Allen. Skycrane: Igor Sikorsky's Last Vision. Reston, Va.: American Institute of Aeronautics and Astronautics, 2010.

Cita MLA (9th ed.)

McKenna, John A., i Ned Allen. Skycrane: Igor Sikorsky's Last Vision. American Institute of Aeronautics and Astronautics, 2010.