International Journal of Educational Technology in Higher Education

Table 1 Distribution of retrieved papers among sources

From: Gamifying education: what is known, what is believed and what remains uncertain: a critical review

Database	Total Amount	No of Selected
ACM Digital Library	285	12 + 1^a
Google Scholar	4021	21 + 8^a
IEEE Explore	574	6
ScienceDirect	158	12 + 3^a

Note: ^aTheoretical Papers

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