Robert M. Sapolsky (2004). “Why Zebras Don't Get Ulcers: The Acclaimed Guide to Stress, Stress-Related Diseases, and Coping - Now Revised and Updated”, p.185, Macmillan
"Fiorina: Trump is a Clinton Christmas gift, I'm the lump of coal; US doing enough to defeat ISIS?". "Fox News Sunday" with Chris Wallace, www.foxnews.com. December 20, 2015.