Music, Singing and Stage Practice in the Cinemas of Upper Silesia during the 1920s - Biel, Urszula (. The @sounds of silent films. - Basingstoke : Palgrave Macmillan, 2014. - XX, 265 Seiten. - Illustrationen, Noten. - ISBN 978-1-137-41071-9, 2014)