Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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