Cita APA (7th ed.)
Hammann, P., & Erichson, B. (1978). Marktforschung: Peter Hammann, Bernd Erichson. G. Fischer.
Cita Chicago (17th ed.)
Hammann, Peter, i Bernd Erichson. Marktforschung: Peter Hammann, Bernd Erichson. Stuttgart, New York: G. Fischer, 1978.
Cita MLA (9th ed.)
Hammann, Peter, i Bernd Erichson. Marktforschung: Peter Hammann, Bernd Erichson. G. Fischer, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.