Rozgonjuk, Dmitri, Valdur Rosenvald, Sven Janno, and Karin Täht. 2016. “Developing a Shorter Version of the Estonian Smartphone Addiction Proneness Scale ”. Cyberpsychology: Journal of Psychosocial Research on Cyberspace 10 (4):Article 4. https://doi.org/10.5817/CP2016-4-4.