Hadady, Letha
Vermilion, 1997
Buku Teks SO
Lippincott Williams & Wilkins, 2006
Buku Referensi
Rogers, Carol
Hamish Hamilton, 1995
Buku Teks SO
Hoffmann, David
Healing Arts Press, 2003
Buku Teks SO
McIntyre, Anne
Judy Piatkus Publishers, 1997
Buku Teks SO