Davis, Gordon B., author
Business One Irwin, 1993
Buku Referensi
Praeger , 1973
Buku Teks
Robson, Wendy, author
Pearson Education , 1997
Buku Teks
Christie, Bruce, author
John Wiley , 1981
Buku Teks
Thomsett, Rob, author
Prentice-Hall, 1993
Buku Teks