Orozco, Luis A. (30 September 2014). Project Closeout Report Francium trapping facility at TRIUMF (Report). United States Department of Energy. doi:10.2172/1214938. OSTI1214938.
Silva, Robert J. (2006). "Fermium, Mendelevium, Nobelium, and Lawrencium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean; Katz, Joseph Jacob (eds.). The Chemistry of the Actinide and Transactinide Elements (3 ed.). Dordrecht: Springer Netherlands. pp. 1621–1651. doi:10.1007/1-4020-3598-5_13. ISBN978-1-4020-3555-5. OCLC262685616.
Orozco, Luis A. (30 September 2014). Project Closeout Report Francium trapping facility at TRIUMF (Report). United States Department of Energy. doi:10.2172/1214938. OSTI1214938.
Fastmarkets Price[56] and Chart[57] Creator. Mid-market price from price table. Year of latest price data (2016) read from chart. Archived: table, chart (5, 7, 50, 1200 data points)
Castor, Stephen B.; Hedrick, James B. (2006). "Rare Earth Elements". In Kogel, Jessica Elzea; Trivedi, Nikhil C.; Barker, James M.; Krukowski, Stanley T. (eds.). Industrial Minerals & Rocks: Commodities, Markets, and Uses (7th ed.). Society for Mining, Metallurgy, and Exploration. p. 785. ISBN978-0-87335-233-8. OCLC62805047.
Silva, Robert J. (2006). "Fermium, Mendelevium, Nobelium, and Lawrencium". In Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean; Katz, Joseph Jacob (eds.). The Chemistry of the Actinide and Transactinide Elements (3 ed.). Dordrecht: Springer Netherlands. pp. 1621–1651. doi:10.1007/1-4020-3598-5_13. ISBN978-1-4020-3555-5. OCLC262685616.