The progress principle : using small wins to ignite joy, engagement, and creativity at work
  MLA
  Kramer, Steven, and Teresa Amabile. The Progress Principle : Using Small Wins to Ignite Joy, Engagement, and Creativity At Work. Boston: Harvard Business Review Press, 2011.
  APA
  Kramer, S., & Amabile, T. (2011). The progress principle : using small wins to ignite joy, engagement, and creativity at work. Boston: Harvard Business Review Press.
  Chicago
  Kramer, Steven, and Teresa Amabile. The Progress Principle: Using Small Wins to Ignite Joy, Engagement, and Creativity At Work. Boston: Harvard Business Review Press, 2011.