Sonntag, Richard Edwin (Personal Name)

Van Wylen, G. J. Fundamentals of classical thermodynamics, 1965.

Ann Arbor News website, viewed 2 May 2014: 8 Febrary page (Richard Edwin Sonntag, Ph.D., Ann Arbor, MI, professor emeritus of mechanical engineering of the University of Michigan, died on Saturday, February 6, 2010. He was born on April 17, 1933, in Chicago. He was at the Department of Mechanical Engineering and Applied Mechanics at the University of Michigan, College of Engineering, from 1983-1992) http://obits.mlive.com/obituaries/annarbor/obituary.aspx?pid=139535714#sthash.5qqCPsUz.dpuf