Polish Painting Masterpieces
Olga Boznanska
"Portrait of the Pianist August Radwan", 1906, oil on cardboard, 75 x 80.3 cm, National Museum, Warsaw

Source: Kopszak, Piotr, „Olga Boznanska [1865-1940]”, „LUDZIE CZASY DZIELA” series, Edipresse Polska S.A., Warszawa 2006, ISBN 83-7477-056-2