1. Randy Pauch. https://www.brainyquote.com/quotes/randy_pausch_564723#.
2. Acts of God While on Vacation. https://www.goodreads.com/author/quotes/5264159.Richard_Tillotson.
3. Rubin PH. Hierarchy. Hum Nat. 2000;11(3):259–79.
4. Martin JJ. Simplifying the academic hierarchy. Acad Bull AAUP. 2002;88(6):36–8.
5. Rubin PH. Op. cit.