Lua APA (7ú heag.)
ebrary, Inc, & Hagen, O. A. (2010). Digital books: Competition and commerce. Nova Science Publishers.
Lua i Stíl Chicago (17ú heag.)
ebrary, Inc, agus Oliver A. Hagen. Digital Books: Competition and Commerce. [Hauppauge, N.Y.]: Nova Science Publishers, 2010.
Lua MLA (9ú heag.)
ebrary, Inc, agus Oliver A. Hagen. Digital Books: Competition and Commerce. Nova Science Publishers, 2010.
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