APA (7th ed.) Citation

SpringerLink (Online service), Nihoyannopoulos, P., & Kisslo, J. (2009). Echocardiography. Springer London.

Chicago Style (17th ed.) Citation

SpringerLink (Online service), Petros Nihoyannopoulos, and Joseph Kisslo. Echocardiography. London: Springer London, 2009.

MLA (8th ed.) Citation

SpringerLink (Online service), et al. Echocardiography. Springer London, 2009.

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