Carcs, F. Maurice Utrillo ... 1921.

Fabris, J. Utrillo, sa vie, son oeuvre, c1982: portada (Utrillo) p. 7 (Maurice Valadon, n. 12/26/1883) p. 13 (paternity claimed by Miguel Utrillo i Morlius, 1891, at that time Maurice assumed surname Utrillo) p. 109 (m. 11/5/1955)

Utrillo Montmartre, c1956: p. 1 (n. in Montmartre) p. 2 (natural child of Suzanne Valadon) p. 3 (outdoor artist; painter)

Union List of Artists Names Online, sitio web, 28 julio 2016: (Utrillo, Maurice (French painter and lithographer, 1883-1955). Names: Utrillo, Maurice; Maurice Utrillo; Valadon, Maurice Utrillo-; Utrillo-Valadon, Maurice; Valadon, Maurice) http://www.getty.edu/vow/ULANFullDisplay?find=Utrillo%2C+Maurice&role=&nation=&prev_page=1&subjectid=500008404

RKD artists, sitio web, 28 julio 2016: (Maurice Utrillo, male / French watercolorist, scenic painter, manufacturer of gouaches, illustrator, lithographer, pastelist, painter, draftsman. Born: Paris, 1883-12-26; Deceased: Dax, 1955-11-05) https://rkd.nl/explore/artists/78861