Chalfant, H. Paul
West Publishing, 1988
Buku Teks SO
Erickson, Bonnie H.
Open University Press, 1977
Buku Teks SO
Persell, Caroline Hodges
Harper & Row, 1984
Buku Teks SO
State University of New York Press, 2001
Buku Teks
Soong Hoom Kil and Chung-in Moon
State University of New York Press, 2001
Buku Teks SO