"Oil According to Hoyle" a review of Hoyle's book "Frontiers of Astronomy" by W.E. Pratt, 1956, Box: 5, Folder: 11. Wallace E. Pratt papers, RH MS 870. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/34085 Accessed February 17, 2025.