‹‹10›› Edward Lee Thorndike, Animal Intelligence: An Experimental Study of the Associative Processes in Animals, Psychological Review Monograph Supplement 2 (1901): 1–109.
‹‹11›› Daniel Schacter, Psychology (2nd ed.) (New York: Worth, 2011), 17.
‹‹12›› Top Secret WWII Bat and Bird Bomber Program, History Net, last modified June 12, 2006, http://www.historynet.com/top-secret-wwii-bat-and-bird-bomber-program.htm.
‹‹13›› Bruce K. Alexander, Robert B. Coambs, and Patricia F. Hadaway, The Effect of Housing and Gender on Morphine Self-Administration in Rats, Psychopharmacology 58, no. 2 (1978): 175–79, doi:10.1007/BF00426903.
‹‹14›› Eryn Paul, «Why Germans Work Fewer Hours But Produce More: A Study in Culture,» KNote, http://knote.com/2014/11/10/why-germans-work-fewer-hours-but-produce-more-a-study-in-culture.
‹‹15›› Kim Witte and Mike Allen, «A Meta-Analysis of Fear Appeals: Implications for Effective Public Health Campaigns,» Health Education & Behavior 27, no. 5 (2000): 591–615, doi:10.1177/109019810002700506.
‹‹16›› Allison Earl and Dolores Albarracin, «Nature, Decay, and Spiraling of the Effects of Fear-Inducing Arguments and HIV Counseling and Testing: A Meta-Analysis of the Short- and Long-Term Outcomes of HIV-Prevention Interventions,» Health Psychology 26, no. 4 (2007): 496–506, doi:10.1037/0278-6133.26.4.496.
‹‹17›› Kirk Mitchell, «Limon prison incentive programs keep inmates in check,» The Denver Post, November 14, 2010, http://www.denver-post.com/2010/11/14/limon-prison-incentive-programs-keep-in-mates-in-check/.
‹‹18›› Daniel Kahneman and Angus Deaton, High Income Improves Evaluation of Life but Not Emotional Well-Being, Proceedings of the National Academy of Sciences 107, no. 38 (2010): 16489–93, doi:10.1073/pnas.1011492107.
‹‹19›› Daniel Kahneman and Angus Deaton, High Income Improves Evaluation of Life but Not Emotional Well-Being, Proceedings of the National Academy of Sciences 107, no. 38 (2010): 16489–93, doi:10.1073/pnas.1011492107.
‹‹20›› Mark R. Lepper, David Greene, and Richard E. Nisbett, Undermining Children’s Intrinsic Interest with Extrinsic Reward: A Test of The ‘overjustification’ hypothesis, Journal of Personality and Social Psychology 28, no. 1 (1973): 129–37, doi:10.1037/h0035519.
‹‹21›› Mark R. Lepper and David Greene, The Hidden Costs of Reward (London and New York: Psychology Press, 1978).
‹‹22›› E. L. Deci, R. Koestner, and R. M. Ryan, A Meta-Analytic Review of Experiments Examining the Effects of Extrinsic Rewards on Intrinsic Motivation, Psychological Bulletin 125, no. 6 (1999): 627–668–700.
‹‹23›› Jesse Singal, «Awareness is Overrated, Science of Us, July 17, 2014, http://nymag.com/scienceofus/2014/07/awareness-is-overrated.html.
‹‹24›› National Institute on Drug Abuse, Evaluation of the Office on National Drug Control Policy (ONDCP) National Youth Anti-Drug Media Campaign, 2006, http://archives.drugabuse.gov/initiatives/westat/.
‹‹25›› Carlos D. Sanchez, L. Kristin Newby, Darren K. McGuire, Vic Hasselblad, Mark N. Feinglos, and E. Magnus Ohman, Diabetes-Related Knowledge, Atherosclerotic Risk Factor Control, and Outcomes in Acute Coronary Syndromes, The American Journal of Cardiology 95, no 11 (2005): 1290–1294, doi:10.1016/j.amjcard.2005.01.070.
‹‹26›› Alfie Kohn, Why Incentive Plans Cannot Work, Harvard Business Review, 1993, https://hbr.org/1993/09/why-incentive-plans-cannot-work.
‹‹27›› Richard A. Guzzo, Richard D. Jette, and Raymond A. Katzell, The Effects of Psychologically Based Intervention Programs on Worker Productivity: A Meta-Analysis, Personnel Psychology 38, no. 2 (1985): 275–291, doi:10.1111/j.1744–6570.1985.tb00547.x.
‹‹28›› Richard A. Guzzo, Richard D. Jette, and Raymond A. Katzell, The Effects of Psychologically Based Intervention Programs on Worker Productivity: A Meta-Analysis, Personnel Psychology 38, no. 2 (1985): 275–291, doi:10.1111/j.1744–6570.1985.tb00547.x, Kohn.
‹‹29›› Amy Adkins, U.S. Employee Engagement Holds Steady at 31.7 %, Gallup, May 7, 2015, http://www.gallup.com/poll/183041/employee-engagement-holds-steady.aspx?utm_source=EMPLOYEE_ENGAGEMENT&utm_medium=topic&utm_campaign=tiles.
‹‹30›› Gamification: Engagement Strategies for Business and IT» Gartner, http://www.gartner.com/technology/research/gamification/.
‹‹31›› Gartner Predicts Over 70 Percent of Global 2000 Organisations Will Have at Least One Gamified Application by 2014, Gartner, November 9, 2011, http://www.gartner.com/newsroom/id/1844115.
‹‹32›› Gartner Says by 2014, 80 Percent of Current Gamified Applications Will Fail to Meet Business Objectives Primarily Due to Poor Design, Gartner, November 27, 2012, http://www.gartner.com/newsroom/id/2251015.
‹‹33›› Wupperman Steel, Enterprise Steel Consultancy, last modified February 7, 2015, http://enterprise-gamification.com/mediawiki/index.php?title=Wuppermann_Steel.
‹‹34›› Steve Lopez, Disneyland workers answer to ‘electronic whip’, Los Angeles Times, October 19, 2011, http://articles.latimes.com/2011/oct/19/local/la-me-1019-lopez-disney-20111018.