Besterfield, Dale H., author
2004
Multimedia
Besterfield, Dale H., author
2004
Multimedia
Caplen, Rowland
Business Books , 1975
Buku Teks
Hradesky, John L., author
McGraw-Hill, 1995
Buku Referensi
Strategic Direction Publishers, [date of publication not identified]
Buku Referensi