Cita APA (7a ed.)

Helfrick, A. (2009). Principles of avionics (5th ed.). Avionics Communications Inc..

Cita Chicago Style (17a ed.)

Helfrick, Albert. Principles of Avionics. 5th ed. Leesburg: Avionics Communications Inc., 2009.

Cita MLA (9a ed.)

Helfrick, Albert. Principles of Avionics. 5th ed. Avionics Communications Inc., 2009.