H. Jackson Brown Jr. (2007). “Complete Life's Little Instruction Book: 1,560 Suggestions, Observations, and Reminders on How to Live a Happy and Rewarding Life”, p.177, Thomas Nelson Inc
"Heidi Klum Shares Her Spring Workout and Diet Secrets (and Guess What: Cheeseburgers Are Allowed)". Interview with Fawnia Soo Hoo, www.glamour.com. March 25, 2014.