Scott, Howard Winfred. An Attempt to Produce a High Octane Gasoline from C4 Hydrocarbons. Denton, Texas. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc32928/. Accessed May 22, 2013.
Scott, Howard Winfred. An Attempt to Produce a High Octane Gasoline from C4 Hydrocarbons. Denton, Texas. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc32928/. Accessed May 22, 2013.