Polish Painting Masterpieces
Witold Wojtkiewicz
"Rocking Horses", sketch for the painting Melancholy, 1907, watercolour, crayon on paper, 27 x 36.5 cm, National Museum, Warsaw

Source: Kossowska, Irena „Witold Wojtkiewicz [1879-1909]”, „LUDZIE CZASY DZIELA” series, Edipresse Polska S.A., Warszawa 2006, ISBN 83-7477-057-0