Köstler, M. E. (2000). Shopping Matters. Cornelsen.
Cita Chicago (17th ed.)Köstler, Maria Elisabeth. Shopping Matters. Berlin: Cornelsen, 2000.
Cita MLA (8th ed.)Köstler, Maria Elisabeth. Shopping Matters. Cornelsen, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.