Johnson, Ruth
Churchill Livingstone/Elsevier, 2010
Buku Teks
WHO , 1999
Buku Teks
edited by Maureen D. Raynor, Jayne E. Marshall and Amanda Sullivan
Elsevier, 2005
Buku Teks
Bryar, Rosamund M.
Palgrave, 1995
Buku Teks
Books for Midwives , 2004
Buku Teks