Cita APA (7th ed.)

Welfens, P. J., & Welfens, M. J. (2011). Der Europäische Chopin. Books on Demand.

Cita Chicago (17th ed.)

Welfens, Paul J.J, i Maria J. Welfens. Der Europäische Chopin. Norderstedt: Books on Demand, 2011.

Cita MLA (8th ed.)

Welfens, Paul J.J, i Maria J. Welfens. Der Europäische Chopin. Books on Demand, 2011.