Gaya APA
Akbar, M, I, A, . et al
(2020).
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Surabaya:
Airlangga University Press.
Gaya MLA
Akbar, Muhammad, Ilham, Aldika, . et al.
"Obstetri Praktis Komprehensif".
Surabaya:
Airlangga University Press,
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Text.