Ehrmann, P. (2011). Spielstunde. Books on Demand.
Cita Chicago (17th ed.)Ehrmann, Patrick. Spielstunde. Norderstedt: Books on Demand, 2011.
Cita MLA (8th ed.)Ehrmann, Patrick. Spielstunde. Books on Demand, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.