Tian, Kelly, author
Quorum Book, 2002
Buku Teks
Allard, Patsy Bailey, author
AMA Membership Publications Division, American Management Associations, 1983
Buku Referensi
Artikel Jurnal
Manajemen Usahawan Indonesia, XXXII (02) Februari 2003: 46-52, 2003
Artikel Jurnal
Rachlin, Robert, author
American Management Association, 1996
eBooks