Howland, Austin E. (1903). "Eighth Annual Exhibition of Paintings at Pittsburgh". Brush and Pencil. 13 (2): 137–153. doi:10.2307/25503679. JSTOR25503679.
Pioch, Nicolas (2002-10-14). "Vermeer, Jan". The WebMuseum. Retrieved 2011-07-05.
jstor.org
Howland, Austin E. (1903). "Eighth Annual Exhibition of Paintings at Pittsburgh". Brush and Pencil. 13 (2): 137–153. doi:10.2307/25503679. JSTOR25503679.