Titus, P., & Willson, J. R. (1961). Management of obstetric difficulties (6th ed.). Mosby.
Cita Chicago (17th ed.)Titus, Paul, i J. Robert Willson. Management of Obstetric Difficulties. 6th ed. St. Louis: Mosby, 1961.
Cita MLA (9th ed.)Titus, Paul, i J. Robert Willson. Management of Obstetric Difficulties. 6th ed. Mosby, 1961.
Atenció: Aquestes cites poden no estar 100% correctes.