Rick Riordan

Sources:
"About Rick Riordan." http://rickriordan.com/about/. Accessed 31 May. 2018.
"Book Review: The Heroes of Olympus Series by Rick Riordan – I Was ...." 20 Nov. 2014, https://angelizedfirst.wordpress.com/2014/11/20/book-review-the-heroes-of-olympus-series-by-rick-riordan/. Accessed 31 May. 2018.
"Rick Riordan - Wikipedia." https://en.wikipedia.org/wiki/Rick_Riordan. Accessed 24 May. 2018.
"Series: "Percy Jackson" By: Rick Riordan — BOOK PIGEON." 22 Jun. 2017, https://www.bookpigeon.com/bloghome/2017/6/22/series-percy-jackson-by-rick-riordan. Accessed 31 May. 2018.
"The Lightning Thief - Wikipedia." https://en.wikipedia.org/wiki/The_Lightning_Thief. Accessed 7 Jun. 2018.