Inscription: Recto, red chalk: Voltaire/Piron; verso, graphite, upper left margin (upside down): Voltaire et Piron
Princess Lubomiriski , Countess of Wisnicz and Jaroslaw (Poland), According to Sperling's inscription on mount; Harry G. Sperling (1906–1971)
Jennifer Tonkovich Claude Gillot and the Theater with a Catalogue of Drawings [Ph.D. disseration]. PhD diss., 2002 cat. no. R10, fig. no. 131, pp. 374-375, ill.