Tharpe, Nell L.
Jones and Bartlett Publishers, 2006
Buku Teks
Uphold, Constance R.
Barmarrae Books, 1999
Buku Referensi
Regional Office for South-East Asia, World Health Organization, United Nations
WHO , 1999
Buku Teks
Bryar, Rosamund M.
Palgrave, 1995
Buku Teks
Books for Midwives , 2004
Buku Teks