Riebe, John M. & Naeseth, Rodger L. Aerodynamic Characteristics of Three Deep-Step Planing-Tail Flying-Boat Hulls and a Transverse-Step Hull with Extended Afterbody, report, August 1952; (https://digital.library.unt.edu/ark:/67531/metadc56457/m1/1/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .