Di John William Waterhouse - 2. Sotheby's, New York, 24 April 2009, lot 561. Source is Masterpiece Oil Paintings Reproduction Gallery: John William Waterhouse English Pre-Raphaelite Painter,Victorian Romanticism 1849-1917, the painting itself is linked here, Pubblico dominio, https://commons.wikimedia.org/w/index.php?curid=720595