Berman Saul J. (2011). Not For Free: Revenue Strategies for a new world. Harvard Business Review Press.
Chicagoスタイル(17版)引用形式Berman Saul J. Not For Free: Revenue Strategies for a New World. Boston: Harvard Business Review Press, 2011.
MLA(9版)引用形式Berman Saul J. Not For Free: Revenue Strategies for a New World. Harvard Business Review Press, 2011.
警告: この引用は必ずしも正確ではありません.