https://www.google.com.br/search?kgmid=/m/0g31t4&hl=pt-BR&kgs=6c3a2d95455caf59&q=will+grosz&shndl=0&source=sh/x/kp&entrypoint=sh/x/kp
2. Wikipedia, the free encyclopedia (acessado em 23/03/2017):
https://en.wikipedia.org/wiki/Wilhelm_Grosz
3. Grove's Dictionary of Music and Musicians, 5th ed. 1954