Lua APA (7ú heag.)
Busch, D. D. (2009). David Busch's Canon EOS 50D guide to digital SLR photography. Course Technology PTR.
Lua i Stíl Chicago (17ú heag.)
Busch, David D. David Busch's Canon EOS 50D Guide to Digital SLR Photography. Boston, MA: Course Technology PTR, 2009.
Lua MLA (9ú heag.)
Busch, David D. David Busch's Canon EOS 50D Guide to Digital SLR Photography. Course Technology PTR, 2009.
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