APA (7th ed.) Citation

Hellman, L. M. (1973). Williams Obstetricia. Salvat Editores S.A.

Chicago Style (17th ed.) Citation

Hellman, Louis M. Williams Obstetricia. Barcelona: Salvat Editores S.A, 1973.

MLA (9th ed.) Citation

Hellman, Louis M. Williams Obstetricia. Salvat Editores S.A, 1973.