Placentum | Midwifery Department, UNS (Universitas Sebelas Maret) Surakarta. Cambridge University Press.
Tohutoru Kātū Chicago (17th ed.)Placentum | Midwifery Department, UNS (Universitas Sebelas Maret) Surakarta. Cambridge University Press.
Tohutoro MLA (9th ed.)Placentum | Midwifery Department, UNS (Universitas Sebelas Maret) Surakarta. Cambridge University Press.
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