APA
"Elkington J., "Hartigan P., .Power of unreasonable people : how social entrepreneurs create markets that change the world. Boston: .
Chicago
"Elkington John", "Hartigan Pamela", .Power of unreasonable people : how social entrepreneurs create markets that change the world. Boston: .
Harvard
"Elkington J., "Hartigan P., .Power of unreasonable people : how social entrepreneurs create markets that change the world. Boston: .
MLA
"Elkington John", "Hartigan Pamela", .Boston: . .