APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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