Ball, Donald A.
Irwin/McGraw-Hill, 2002
Multimedia
Michael R. Czinkota, Ronkainen Ilkka A., Michael H.Moffett, Eugene O. Moynihan, ... [et al.].
Harcourt College publishers, 2001
Buku Teks
Wormald, Avison
Pan Books, 1973
Buku Teks SO
Rugman, Alan M.
McGraw-Hill , 1985
Buku Teks
Martyn, Howe
Lexington Books, 1972
Buku Teks