Tharpe, Nell L.
Jones and Bartlett, 2009
Buku Teks SO
Uphold, Constance R.
Barmarrae Books, 1999
Buku Referensi
Regional Office for South-East Asia, World Health Organization, United Nations
WHO , 1999
Buku Teks SO
edited by Maureen D. Raynor, Jayne E. Marshall and Amanda Sullivan
Elsevier, 2005
Buku Teks SO
Bryar, Rosamund M.
Palgrave, 1995
Buku Teks SO