Rozgonjuk, Dmitri, Valdur Rosenvald, Sven Janno, and Karin Täht. “Developing a Shorter Version of the Estonian Smartphone Addiction Proneness Scale (E-SAPS18)”. Cyberpsychology: Journal of Psychosocial Research on Cyberspace 10, no. 4 (December 1, 2016): Article 4. Accessed May 10, 2025. https://cyberpsychology.eu/article/view/6277.