Hudson, Robert V., author
Garland publishing, 1987
Buku Referensi
Vivian, John, author
Pearson and AB, 2007
Buku Teks
Dominick, Joseph R., author
McGraw-Hill, 1993
Buku Teks
Dominick, Joseph R., author
Random House, 1983
Buku Teks
edited by Warren K. Agee, Phillip H. Ault, Edwin Emery
Harper and Row, 1982
Buku Teks