Morgan, K. Z.; Davis, D. M.; Hart, J. C.; Abee, H. H.; Gupton, E. D. & Warden, A. D. Applied Health Physics Annual Report for 1963, report, August 1964; (https://digital.library.unt.edu/ark:/67531/metadc100291/m1/1/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .