Харолд Фостер — разлика између измена

* -{Blackbeard, Bill. "Artist of the Absurd", Tarzan in Color. Vol. 1. 1931–1932 New York: Flying Buttress Classics Library.}-. {{page|year=|idisbn=ISBN 978-1-56163-049-3 |pages=}}

* -{Kane, Brian M (2001),. Hal Foster: Prince of Illustrators, Vanguard Productions,}-. . {{page|year=2001|idisbn=ISBN 978-1-887591-25-6|pages=}}

* -{Kane, Brian M (2009),. The Definitive Prince Valiant Companion, Fantagraphics Books,}-. . {{page|year=2009|isbn=978-1-60699-305-7|pages=}}