Cita APA (7th ed.)

Fenner, K. (1977). Causes of variable tuning characteristics of pianos. Europaische Union der Pianomacher-Fachverbande].

Cita Chicago (17th ed.)

Fenner, Klaus. Causes of Variable Tuning Characteristics of Pianos. [Frankfurt am Main: Europaische Union der Pianomacher-Fachverbande], 1977.

Cita MLA (8th ed.)

Fenner, Klaus. Causes of Variable Tuning Characteristics of Pianos. Europaische Union der Pianomacher-Fachverbande], 1977.