APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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