In: Handbook of Research on Cross-Disciplinary Uses of Gamification in Organizations IGI Global, Hershey (PA), pp. 445-466.

Digital Presentation and Preservation of Cultural and Scientific Heritage, 12, pp. 63-74. ISSN 1314-4006

In: 19th Multimedia in Education Conference Proceedings, 2013-06-13 - 2013-06-14, Kassa, Szlovákia.

In: Proceedings of the Seventh International Conference Digital Presentation and Preservation of Cultural and Scientific Heritage DiPP (7) Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, Sofia, pp. 113-122. ISSN 1314-4006

In: Veliko Tarnovo - a candidate for European capital of culture 2019, 2013-09-19, Veliko Tarnovo, Bulgária.

In: Proceedings of the Seventh International Conference Digital Presentation and Preservation of Cultural and Scientific Heritage DiPP (7) Institute of Mathematics and Informatics, Bulgarian Academy of Sciences, Sofia, pp. 123-132. ISSN 1314-4006

In: Digital Presentation and Preservation of Cultural and Scientific Heritage International Conference, 2013-09-18 - 2013-09-21, Veliko Tarnovo, Bulgária.

In: Proceedings of the 8th Japanese-Hungarian Symposium on Discrete Mathematics and Its Applications, 2013-06-04 - 2013-06-07, Veszprém, Magyarország.

Élet és Tudomány ISSN 0013-6077

In: Conference Computer Science and Information Technologies. Proceedings, 2013-09-23 - 2013-09-27, Jereván, Örményország.