An investigation into problematic smartphone use: The role of narcissism, anxiety, and personality factors / Zaheer Hussain, Mark D. Griffiths, David Sheffield
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  In: Journal of Behavioral Addictions. - ISSN 2062-5871, eISSN 2063-5303. - 2017. 6. évf. 3. sz., p. 378-386. : ill.