1. Augustine. (n.d.). On the Trinity Book IV. The Logic Museum. http://www.logicmuseum.com/wiki/Authors/Augustine/On_the_Trinity/On_the_Trinity_Book_IV#4_21_30
2. Baltzly, D. (2019). Stoicism. https://plato.stanford.edu/archives/spr2019/entries/stoicism/
3. Bolman, L. (1998). Aviation accidents and the theory of the situation. Resource Management on the Flight Deck, 31–58. https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19800013798.pdf
4. Brueggemann, W. & Hanson, K. C. (2012). Remember you are dust. Wipf and Stock Publishers. https://login.elibrary.johnsonu.edu/login?url=http://search.ebscohost.com/login.aspx?direct=true&db=cat05346a&AN=glass.ocn899739167&site=eds-live