APA (7th ed.) Citation

Perez Sanchez, A., & Donoso Siña, E. (1999). Obstetricia.

Chicago Style (17th ed.) Citation

Perez Sanchez, Alfredo, and Enrique Donoso Siña. Obstetricia. 1999.

MLA (9th ed.) Citation

Perez Sanchez, Alfredo, and Enrique Donoso Siña. Obstetricia. 1999.

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