Titus, P., & Willson, J. R. (1961). Management of obstetric difficulties (6th ed.). Mosby.
Lua i Stíl Chicago (17ú heag.)Titus, Paul, agus J. Robert Willson. Management of Obstetric Difficulties. 6th ed. St. Louis: Mosby, 1961.
Lua MLA (9ú heag.)Titus, Paul, agus J. Robert Willson. Management of Obstetric Difficulties. 6th ed. Mosby, 1961.
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