Marceau, Henri (1931). "Bulletin of the Pennsylvania Museum, Vol. 26, No. 142, Part 1". Bulletin of the Pennsylvania Museum. 26 (142). Pennsylvania Museum of Art: 10–13. doi:10.2307/3794543. JSTOR3794543.
Marceau, Henri (1931). "Bulletin of the Pennsylvania Museum, Vol. 26, No. 142, Part 1". Bulletin of the Pennsylvania Museum. 26 (142). Pennsylvania Museum of Art: 10–13. doi:10.2307/3794543. JSTOR3794543.