Slaby, Andrew E.
Henry Kimpton, 1975
Buku Teks
Paquette, Mary, author
Jones and bartlett , 1991
Buku Teks
Glod, Carol A.
F.A. Davis Company , 1998
Buku Teks
Wilson, Holly Skodol, author
Addison-Wesley, 1983
Buku Teks
Wilson, Holly Skodol, author
Addison-Wesley, 1979
Buku Teks