Cita APA (7a ed.)

Spiller, L. D., & Baier, M. (2004). Contemporary direct marketing. Pearson Education/ Prentice Hall.

Cita Chicago Style (17a ed.)

Spiller, Lisa D., y Martin Baier. Contemporary Direct Marketing. Upper Saddle River, N.J.: Pearson Education/ Prentice Hall, 2004.

Cita MLA (9a ed.)

Spiller, Lisa D., y Martin Baier. Contemporary Direct Marketing. Pearson Education/ Prentice Hall, 2004.