Cita APA (7a ed.)

Roldan, C. A. (2005). The ultimate echo guide. Lippincott Williams & Wilkins.

Cita Chicago Style (17a ed.)

Roldan, Carlos A. The Ultimate Echo Guide. Philadelphia: Lippincott Williams & Wilkins, 2005.

Cita MLA (9a ed.)

Roldan, Carlos A. The Ultimate Echo Guide. Lippincott Williams & Wilkins, 2005.