APA (7th ed.) Citation

Pritchard, J. A., MacDonald, P. C., & Williams, J. W. (1979). Williams obstetricia (2a ed.). Salvat Editores.

Chicago Style (17th ed.) Citation

Pritchard, Jack A., Paul C. MacDonald, and J. Whitridge Williams. Williams Obstetricia. 2a ed. Barcelona, España: Salvat Editores, 1979.

MLA (9th ed.) Citation

Pritchard, Jack A., et al. Williams Obstetricia. 2a ed. Salvat Editores, 1979.