Whitfield, John, author
EPA Press, 1995
Buku Referensi
edited by Anthony Chalcraft [and others]
Library Association, 1992
Buku Referensi
Asian Venture Capital Journal, 1997
Buku Referensi
Hanselman, Duane, author
Prentice-Hall, 1997
Buku Teks
McGarry, Kevin
Library Association , 1991
Buku Teks