APA (7th ed.) Citation

Beart, R. W., & Sapiña Renard, S. Cirugía anorrectal.

Chicago Style (17th ed.) Citation

Beart, Robert W., and Santiago Sapiña Renard. Cirugía Anorrectal.

MLA (8th ed.) Citation

Beart, Robert W., and Santiago Sapiña Renard. Cirugía Anorrectal.

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