Hounshell, David A., Smith, John Kenley. Science and Corporate Strategy. DuPont R&D, 1902–1980, New York: Cambridge University Press, 1988, ISBN 978-0-521-02852-3 .
Speight, James G. (2008). Synthetic Fuels Handbook: Properties, Process, and Performance. McGraw-Hill Professional. pp. 9–10. ISBN 978-0-07-149023-8 .
Rottenberg, Dan (2003). In the Kingdom of Coal; An American Family and the Rock That Changed the World. Routledge. ISBN 0-415-93522-9 . OCLC 52348860.