APA aipamena

Berman Saul J. (2011). Not For Free: Revenue Strategies for a new world. Harvard Business Review Press.

Chicago Style aipamena

Berman Saul J. Not For Free: Revenue Strategies for a New World. Boston: Harvard Business Review Press, 2011.

MLA aipamena

Berman Saul J. Not For Free: Revenue Strategies for a New World. Harvard Business Review Press, 2011.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.