*[http://www.nasonline.org/publications/biographical-memoirs/memoir-pdfs/hulse-frederick.pdf n a t i o n a l a c a d e m y o f s c i e n c e s-F r e d e r i c k S e y m o u r H u l s e ]

*[https://www.nap.edu/read/5406/chapter/10 National Academy of Sciences-FREDERICK SEYMOUR HULSE February 11, 1906-May 16, 1990 ]