Cita APA

Kennedy, D. S. (2009). The ultimate sales letter (third.). Adams Publ.

Citación estilo Chicago

Kennedy, Dan S. The Ultimate Sales Letter. third. Avon: Adams Publ, 2009.

Cita MLA

Kennedy, Dan S. The Ultimate Sales Letter. third. Adams Publ, 2009.

Warning: These citations may not always be 100% accurate.