Owens, Richard N.
Homewood, Ill. Richard D. Irwin, Inc , 1958
Buku Teks
Glueck, William F., author
McGraw-Hill, 1972
Buku Teks
Buchholz, Rogene A., author
Prentice-Hall, 1989
Buku Teks
Davis, Keith, 1918-, author
McGraw-Hill, 1984
Buku Teks
Glueck, William F., author
McGraw-Hill, 1976
Buku Teks