Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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