Roldan, C. A. (2005). The ultimate echo guide. Lippincott Williams & Wilkins.
Citación estilo ChicagoRoldan, Carlos A. The Ultimate Echo Guide. Philadelphia: Lippincott Williams & Wilkins, 2005.
Cita MLARoldan, Carlos A. The Ultimate Echo Guide. Lippincott Williams & Wilkins, 2005.
Warning: These citations may not always be 100% accurate.