Cita APA (7th ed.)
Helfrick, A. (2000). Principles of Avionics (9th ed.). Avionics Communications Inc.
Cita Chicago (17th ed.)
Helfrick, Albert. Principles of Avionics. 9th ed. United States of America: Avionics Communications Inc, 2000.
Cita MLA (9th ed.)
Helfrick, Albert. Principles of Avionics. 9th ed. Avionics Communications Inc, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.