APA (7th ed.) Citation

Martius, H., Hartl, H., Droysen, K., Usandizaga Soraluce, M., & Gil Vernet, E. (1960). Tratado de obstetricia. Labor.

Chicago Style (17th ed.) Citation

Martius, Heinrich, H. Hartl, Käthe Droysen, Manuel Usandizaga Soraluce, and Emilio Gil Vernet. Tratado De Obstetricia. Barcelona [etc.]: Labor, 1960.

MLA (9th ed.) Citation

Martius, Heinrich, et al. Tratado De Obstetricia. Labor, 1960.