Burns,Thomas J., author
McGraw-Hill, 1986
Buku Teks
Carlson, Arthur E., author
South-Western Publishing , 1982
Buku Teks
Cerepak, John R., author
Prentice-Hall, 1987
Buku Teks
Ventolo, William L.
Educational Methods , 1967
Buku Teks
Dupree, Dempsey
Addison-Wesley Pub. Co., 1984
Buku Teks