APA (7th ed.) Citation

Hagen, O. A. (2010). Digital books: Competition and commerce. Nova Science Publishers.

Chicago Style (17th ed.) Citation

Hagen, Oliver A. Digital Books: Competition and Commerce. New York: Nova Science Publishers, 2010.

MLA (9th ed.) Citation

Hagen, Oliver A. Digital Books: Competition and Commerce. Nova Science Publishers, 2010.

Warning: These citations may not always be 100% accurate.