Riordan, Rick $0(DLC)345342; Riordan, Rick (29 April 2018). The mark of Athena. Hyperion. ISBN9781423140603. Archived from the original on 1 January 2015. Retrieved 29 April 2018 – via kcls Library Catalog.{{cite book}}: CS1 maint: numeric names: authors list (link)
Riordan, Rick (September 27, 2013). "The Mark of Athena Excerpt"(PDF). The Heroes of Olympus. Disney-Hyperion. pp. 1–12. Archived(PDF) from the original on March 23, 2016. Retrieved August 30, 2015.
Riordan, Rick (September 27, 2013). "The Mark of Athena Excerpt"(PDF). The Heroes of Olympus. Disney-Hyperion. pp. 1–12. Archived(PDF) from the original on March 23, 2016. Retrieved August 30, 2015.
"A Home Run for 'Hades'". Publishers Weekly. October 18, 2013. Archived from the original on September 3, 2014. Retrieved September 1, 2014.
Riordan, Rick $0(DLC)345342; Riordan, Rick (29 April 2018). The mark of Athena. Hyperion. ISBN9781423140603. Archived from the original on 1 January 2015. Retrieved 29 April 2018 – via kcls Library Catalog.{{cite book}}: CS1 maint: numeric names: authors list (link)