The right half of the sheet, with studies of fifteen heads, including a mask in profile, upper right corner, repeats a drawing by an imitator of Cambiaso in the Accademia, Venice (inv. no. 418). Both the left and right sections are repeated in two studio drawings in Berlin (inv. nos. 16031 and 16032).

Turner, Nicholas, From Michelangelo to Annibale Carracci. A century of Italian drawings from the Prado, Chicago, Art Services International, 2008, p.280