Singh A., Misra N. Loneliness, Depression, and Sociability in Old Age // Industrial Psychiatry Journal, 2009. Vol. 18, № 1. P. 51–55.
150
Austin M. Wasted time in meetings costs businesses £26 billion: The average employee wastes two hours and 39 minutes in meetings every week // Techradar, 2012. May 21 / accessed September 15, 2014 // .