Cita APA (7th ed.)
Helfrick, A. (2004). Principles of Avionics (3rd ed.). Avionics Communications Inc.
Cita Chicago (17th ed.)
Helfrick, Albert. Principles of Avionics. 3rd ed. United States of America: Avionics Communications Inc, 2004.
Cita MLA (9th ed.)
Helfrick, Albert. Principles of Avionics. 3rd ed. Avionics Communications Inc, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.