Cita APA (7th ed.)
Gary Armstrong, K. Principles of Marketing. Pearson.
Cita Chicago (17th ed.)
Gary Armstrong, Kotlar. Principles of Marketing. Pearson.
Cita MLA (9th ed.)
Gary Armstrong, Kotlar. Principles of Marketing. Pearson.
Atenció: Aquestes cites poden no estar 100% correctes.