Rick Riordan
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"Rick Riordan."
Famous Authors
. N.p., n.d. Web. 6 June 2013.
<http://www.famousauthors.org/rick-riordan>.
"Rick Riordan."
Paper Back Swap
. N.p., n.d. Web. 5 June 2013.
<http://www.paperbackswap.com/Rick-Riordan/author/>.