Polish Painting Masterpieces
Piotr Michalowski
"The Artist's Son on a Donkey", c. 1840, oil on canvas, 70.7 x 56 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