APA (7th ed.) Citation

Elkington, J., & Hartigan. (2008). The power of unreasonable people: How social entrepreneurs create markets that change the world. Harvard Business School Press.

Chicago Style (17th ed.) Citation

Elkington, John, and Hartigan. The Power of Unreasonable People: How Social Entrepreneurs Create Markets That Change the World. Boston. Mass: Harvard Business School Press, 2008.

MLA (8th ed.) Citation

Elkington, John, and Hartigan. The Power of Unreasonable People: How Social Entrepreneurs Create Markets That Change the World. Harvard Business School Press, 2008.