W.H. Freeman and Company, 2013. Sixth ed., p. 27. Nelson, David L., Cox, Michael M. Lehninger: Principles of Biochemistry. New York: W.H. Freeman and Company
6th ed. Jones and Bartlett Publishers. ISBN 0-7637-1511-5 David L. Nelson & Michael M. cox. Lehinger. Principles of Biochemistry. 4th ed. Freeman. ISBN