Nhất Hạnh (Thích.), Thich Nhat Hanh (1998). “The Heart of the Buddha's Teaching: Transforming Suffering Into Peace, Joy, & Liberation : the Four Noble Truths, the Noble Eightfold Path, & Other Basic Buddhist Teachings”
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.272, Macmillan