Blair et al. (2016)
Also: Blair et al. 2016
Understanding the Role of Achievements in Game-Based Learning
Blair, L., Bowers, C., Cannon-Bowers, J. & Gonzalez-Holland, E. (2016). Understanding the Role of Achievements in Game-Based Learning. International Journal of Serious Games. 3(4). PDF
https://doi.org/10.17083/ijsg.v3i4.114
References
All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.