Cita APA (7th ed.)

Sterzik, R. (2014). Yamaha Keyboard Class (1. Aufl.). Yamaha.

Cita Chicago (17th ed.)

Sterzik, Roman. Yamaha Keyboard Class. 1. Aufl. Rellingen: Yamaha, 2014.

Cita MLA (8th ed.)

Sterzik, Roman. Yamaha Keyboard Class. 1. Aufl. Yamaha, 2014.