Tapp, A. (2012). Principles of Direct and Database Marketing (4th.). Pearson.
Cita Chicago (17th ed.)Tapp, Alan. Principles of Direct and Database Marketing. 4th. Pearson, 2012.
Cita MLA (9th ed.)Tapp, Alan. Principles of Direct and Database Marketing. 4th. Pearson, 2012.
Atenció: Aquestes cites poden no estar 100% correctes.