Lua APA (7ú heag.)

Leveno, K. J. (2003). Williams manual of obstetrics (21st ed.). McGraw-Hill.

Lua i Stíl Chicago (17ú heag.)

Leveno, Kenneth J. Williams Manual of Obstetrics. 21st ed. Boston: McGraw-Hill, 2003.

Lua MLA (9ú heag.)

Leveno, Kenneth J. Williams Manual of Obstetrics. 21st ed. McGraw-Hill, 2003.

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