Dik, B. J., & Duffy, R. D. (2012). Make your job a calling: How the psychology of vocation can change your life at work. Templeton Press.

Dik, Bryan J., and Ryan D. Duffy. Make Your Job a Calling: How the Psychology of Vocation Can Change Your Life at Work. West Conshohocken, PA: Templeton Press, 2012.

Dik, Bryan J., and Ryan D. Duffy. Make Your Job a Calling: How the Psychology of Vocation Can Change Your Life at Work. Templeton Press, 2012.