Strommen, Ellen A.
Dorsey Press, 1983
Buku Teks SO
Fitagerald, Hiram E
0, 1982
Buku Teks
Liebert, Robert M., 1942-
Prentice-Hall, 1986
Buku Teks SO
Patrick Leman, Andy Bremner, Ross D Parke, Mary Guavain
McGraw-Hill, 2012
Buku Teks SO
Hurlock, Elizabeth Bergner, 1898-
Tata McGraw-Hill, 1979
Buku Teks SO