Carver, Keith R.
John Wiley & Sons, 1983
Buku Teks SO
Mandell, Steven L.
West Publishing, 1983
Buku Teks SO
Slotnick, Daniel L.
D.C. Heath, 1986
Buku Teks
Slotnick, Daniel L.
D.C. Health, 1986
Buku Teks
Mandell, Steven L.
West Publishing Company, 1982
Buku Referensi