Foster, Illysa R.
Jones & Bartlett Learning, 2011
Buku Teks SO
Yelland, Sharon
Elsevier , 2005
Buku Teks SO
Varney, Helen
Blackwell Scientific Publications, 1987
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