Bell, Joe W. & Havens, Robert F. Tank Tests of a 1/8-Size Dynamic Model of the PB2Y-3 Airplane with Simulated Jet Motors: NACA Models 131J, 131J-1 and 131J-2, report, June 1943; (https://digital.library.unt.edu/ark:/67531/metadc61767/m1/1/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .