Frierson, Michael (1993). "The Invention of Plasticine and the Use of Clay in Early Motion Pictures". Film History. 5 (2): 142–157. ISSN0892-2160. JSTOR27670717.
Frierson, Michael (1993). "The Invention of Plasticine and the Use of Clay in Early Motion Pictures". Film History. 5 (2): 142–157. ISSN0892-2160. JSTOR27670717.