Ziegel, E., & Van Blarcom, C. C. (1972). Obstetric nursing. Macmillan.
Lua i Stíl Chicago (17ú heag.)Ziegel, Erna, agus Carolyn Conant Van Blarcom. Obstetric Nursing. New York: Macmillan, 1972.
Lua MLA (9ú heag.)Ziegel, Erna, agus Carolyn Conant Van Blarcom. Obstetric Nursing. Macmillan, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.