Gaya APA

Kotter, J, P., Cohen, D, S. (2002). The heart of change : real-life stories of how people change their organization . United States of America: Harvard Bussiness Review Press.

Gaya MLA

Kotter, John, P.., Cohen, Dan, S.. "The heart of change : real-life stories of how people change their organization". United States of America: Harvard Bussiness Review Press, 2002. .