Zinsmeister, A. (2006). Nicole Nickel: Playground.
Cita Chicago (17th ed.)Zinsmeister, Annett. Nicole Nickel: Playground. Berlin, 2006.
Cita MLA (8th ed.)Zinsmeister, Annett. Nicole Nickel: Playground. 2006.
Atenció: Aquestes cites poden no estar 100% correctes.