Cita APA (7a ed.)
ebrary, Inc, & Hagen, O. A. (2010). Digital books: Competition and commerce. Nova Science Publishers.
Cita Chicago Style (17a ed.)
ebrary, Inc, y Oliver A. Hagen. Digital Books: Competition and Commerce. [Hauppauge, N.Y.]: Nova Science Publishers, 2010.
Cita MLA (9a ed.)
ebrary, Inc, y Oliver A. Hagen. Digital Books: Competition and Commerce. Nova Science Publishers, 2010.
Precaución: Estas citas no son 100% exactas.