Polish Painting Masterpieces
Witold Wojtkiewicz
"Possession. Madmen on the Snow", sketch for the painting Possession, 1906, watercolour on paper, 31 x 47 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