T. Colin Campbell, Thomas M. Campbell (II.) (2006). “The China Study: The Most Comprehensive Study of Nutrition Ever Conducted and the Startling Implications for Diet, Weight Loss and Long-term Health”, p.21, BenBella Books
Horace (1836). “The works of Horace: translated literally into English prose; for the use of those who are desirous of acquiring or recovering a competent knowledge of the Latin language”, p.29