Brosnan JT, Brosnan ME: The sulfur-containing amino acids: an overview. In: The Journal of Nutrition. Band136, 6 Suppl, Juni 2006, S.1636S–1640S, PMID 16702333 (englisch).
The acronym S.P. Cohn was also used in high school biology classes to represent the six chemical elements.
Education: CHNOPS: The Six Most Abundant Elements of Life. In: Pearson Education.Pearson BioCoach, 2010, abgerufen am 10. Dezember 2010 (englisch): „Most biological molecules are made from covalent combinations of six important elements, whose chemical symbols are CHNOPS. ... Although more than 25 types of elements can be found in biomolecules, six elements are most common. These are called the CHNOPS elements; the letters stand for the chemical abbreviations of carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur.“
Neil A. Campbell, Brad Williamson, Robin J. Heyden: Biology: Exploring Life. Pearson Prentice Hall, Boston, Massachusetts 2006, ISBN 0-13-250882-6 (englisch, phschool.com).
