Cita APA

Titus, P., & Willson, J. R. (1961). Management of obstetric difficulties (6th ed.). Mosby.

Citación estilo Chicago

Titus, Paul, and J. Robert Willson. Management of Obstetric Difficulties. 6th ed. St. Louis: Mosby, 1961.

Cita MLA

Titus, Paul, and J. Robert Willson. Management of Obstetric Difficulties. 6th ed. Mosby, 1961.