Cita APA (7th ed.)

Gardner, P. (1998). The nine-note recorder method: Easy duets for beginners (1a. ed.). Penny Gardner.

Cita Chicago (17th ed.)

Gardner, Penny. The Nine-note Recorder Method: Easy Duets for Beginners. 1a. ed. s.l: Penny Gardner, 1998.

Cita MLA (9th ed.)

Gardner, Penny. The Nine-note Recorder Method: Easy Duets for Beginners. 1a. ed. Penny Gardner, 1998.