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Lua i Stíl Chicago (17ú heag.)Levy, valerie, sarah Roch, agus jo Alexander. Aspects of Midwifery Practice: A Research Based Approach. Macmillan Press, 1995.
Lua MLA (9ú heag.)Levy, valerie, et al. Aspects of Midwifery Practice: A Research Based Approach. Macmillan Press, 1995.
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