Miner, William N.; Schonfeld, Fred W. (1968). "Plutonium". In Clifford A. Hampel (ed.). The Encyclopedia of the Chemical Elements. New York (NY): Reinhold Book Corporation. p. 541. LCCN68029938.
Cabell, M. J.; Slee, L. J. (1962). "The ratio of neutron capture to fission for uranium-235". Journal of Inorganic and Nuclear Chemistry. 24 (12): 1493–1500. doi:10.1016/0022-1902(62)80002-5.
Miner, William N.; Schonfeld, Fred W. (1968). "Plutonium". In Clifford A. Hampel (ed.). The Encyclopedia of the Chemical Elements. New York (NY): Reinhold Book Corporation. p. 541. LCCN68029938.