Epstein, R., & Rogers, J. (2001). The big book of motivation games: Quick, fun activities for energizing people at work and at home. McGraw-Hill.
Chicago-viite (17. p.)Epstein, Robert, ja Jessica Rogers. The Big Book of Motivation Games: Quick, Fun Activities for Energizing People at Work and at Home. New York: McGraw-Hill, 2001.
MLA-viite (9. p.)Epstein, Robert, ja Jessica Rogers. The Big Book of Motivation Games: Quick, Fun Activities for Energizing People at Work and at Home. McGraw-Hill, 2001.
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