Gricius, Pierre: Painter Jean Jacoby and Sculptor Frantz Heldenstein: A Pair of Unknown Luxemburg Medalists and the Story of the Olympic Art Competitions. Journal of Olympic History, Huhtikuu 2010, 18. vsk, nro 1, s. 16. International Society of Olympic Historians (ISOH). ISSN 1085-5165Artikkelin verkkoversio. (PDF) Viitattu 22.2.2020. (englanniksi)
OLYMPIC GAMES ART COMPETITION MEDALLISTS (Sivu 16) Art competitions at the Olympic Games. 2.5.2019. The Olympic Studies Centre/ Olympic Foundation for Culture and Heritage. Viitattu 22.2.2020. (englanniksi)
rkd.nl
Jean René GauguinArtists. RKD – Netherlands Institute for Art History. Viitattu 22.2.2020. (englanniksi)
Gricius, Pierre: Painter Jean Jacoby and Sculptor Frantz Heldenstein: A Pair of Unknown Luxemburg Medalists and the Story of the Olympic Art Competitions. Journal of Olympic History, Huhtikuu 2010, 18. vsk, nro 1, s. 16. International Society of Olympic Historians (ISOH). ISSN 1085-5165Artikkelin verkkoversio. (PDF) Viitattu 22.2.2020. (englanniksi)