Gaya APA

Otto, C, M. et al (2020). Echocardiography Review Guide : Companion to the Textbook of Clinical Echocardiography (4th ed). Philadelphia: Elsevier.

Gaya MLA

Otto, Catherine, M.. et al. "Echocardiography Review Guide : Companion to the Textbook of Clinical Echocardiography". 4th ed Philadelphia: Elsevier, 2020. Text.