Sanders, John C. & Chapin, Edward C. Equilibrium Operating Performance of Axial-Flow Turbojet Engines by Means of Idealized Analysis, report, February 25, 1949; (https://digital.library.unt.edu/ark:/67531/metadc60326/m1/1/: accessed January 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .