APA (7th ed.) Zitazioa
Busch, D. D. (2009). David Busch's Canon EOS 50D guide to digital SLR photography. Course Technology PTR.
Chicago Style (17th ed.) Zitazioa
Busch, David D. David Busch's Canon EOS 50D Guide to Digital SLR Photography. Boston, MA: Course Technology PTR, 2009.
MLA (9th ed.) Zitazioa
Busch, David D. David Busch's Canon EOS 50D Guide to Digital SLR Photography. Course Technology PTR, 2009.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.