Peurifoy, Reneau Z., author
Warner Books, 2005
Buku Teks
Whiteman, Thomas, author
Zondervan, 1996
Buku Teks
McCarthy, Richard C., author
[American Library association;American Library association, American Library association], 2007
eBooks
Cotsakos, Christos M., author
Harper Business, 2000
Buku Teks
Walliman, Nicholas, author
Sage Publications Ltd , 2001
Buku Teks