Michael Saffle. (2010). Richard Wagner: A research and information guide. Routledge.
Chicago Style aipamenaMichael Saffle. Richard Wagner: A Research and Information Guide. New York: Routledge, 2010.
MLA aipamenaMichael Saffle. Richard Wagner: A Research and Information Guide. Routledge, 2010.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.