1. Change: The Ultimate Certainty
2. Jones WH. trans. Hippocrates. Cambridge, MA: Harvard Univ Press, 1923: 85 (Loeb Classical Library: vol 1)
3. Dunn HL. High-level wellness. Arlington. VA: RW Beatty, 1961: 2
4. Travis JW. The wellness workbook. Mill Valley. CA: Wellness Resource Center. 1977: 3