एपीए उद्धरण

Berman, S. J. 1. (2011). Not for free: Making money in the digital age. Boston, Mass: Harvard Business Review Press.

शिकागो स्टाइल उद्धरण

Berman, Saul Jay 1946-. Not for Free: Making Money in the Digital Age. Boston, Mass: Harvard Business Review Press, 2011.

एमएलए उद्धरण

Berman, Saul Jay 1946-. Not for Free: Making Money in the Digital Age. Boston, Mass: Harvard Business Review Press, 2011.