1. Bailey, R.
(2018). Retrieved from http://theconversation.com/the-dark-side-of-daydreaming-91340
. Accessed on December 26, 2019.
2. Yin and yang: The relationship of leisure and work,2013
3. Silo ice climbing: An exploration of a new outdoor leisure activity;Journal of Outdoor Recreation, Education, and Leadership,2014