Collin, P. H., author
Peter Collin Publishing, 2001
Buku Teks
Statt, David A., author
Routledge, 1999
Buku Referensi
Friedman, Jack P., author
Barron's Educational Series, 2007
Buku Referensi
Kurian, George Thomas, author
Amacom, 2013
Buku Referensi
Rosenberg, Jerry M., author
John Wiley & Sons, 1993
Buku Referensi