Polish Painting Masterpieces
Piotr Michalowski
"Rural Elder", after 1840, oil on canvas, 60.5 x 46 cm, National Museum, Warsaw

Source: Czapska-Michalik, Magdalena, „Piotr Michalowski [1800-1855]”, „LUDZIE CZASY DZIELA” series, Edipresse Polska S.A., Warszawa 2007, ISBN 978-83-7477-208-2