Janssen, Mark, 1974- (Nombre personal)

Rieu, Jean-Philippe. Marie, 2009 : p. facing t.p. (illustrated by Mark Janssen)

Vierwindstreken website, June 7, 2010 (Mark Janssen ; b. July 24, 1974 in Eijsden, Netherlands ; lives in Valkenburg)

NTA in VIAF, Ap. 11, 2018 (Janssen, Mark‏ (Marcus Jacques Agnes), 1974-‏ ; author/illustrator ; Netherlands)