1. Ostwald, W. The Fundamental Principles of Chemistry: An Introduction to All Text-books of Chemistry (Longmans, Green, 1909).
2. Holme, T. & Murphy, K. J. Chem. Educ. 89, 721–723 (2012).
3. Pollan, M. in Food Rules: An Eater's Manual Ch. 7 (Penguin, 2009).
4. Purcell, E. M. in Nobel Lectures, Physics 1942-1962 219–231 (Elsevier, 1964);
http://go.nature.com/kUa4G6