Melinda Beck, Anxiety Can Bring Out the Best, Wall Street Journal, 18.06.2012.
27
Alexander Graham Bell, Discovery and Invention, National Geographic vol. 25 (06/1914): 650.
28
Yue Wang, More People Have Cell Phones Than Toilets, U. N. Study Shows, Time, 25.03.2013; Victoria Woollaston, How Often Do You Check Your Phone? Daily Mail, 08.10.2013.
