Block, R. (1999). Robert Watts: The invisible man of Fluxus and Pop.
Chicago-Zitierstil (17. Ausg.)Block, René. Robert Watts: The Invisible Man of Fluxus and Pop. Kassel, 1999.
MLA-Zitierstil (8. Ausg.)Block, René. Robert Watts: The Invisible Man of Fluxus and Pop. 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.