Melcher, F.; Graupner, T.; Oberthür, T.; Schütte, P. (1 March 2017). "Tantalum-(niobium-tin) mineralisation in pegmatites and rare-metal granites of Africa". South African Journal of Geology. 120 (1): 77–100. Bibcode:2017SAJG..120...77M. doi:10.25131/gssajg.120.1.77.
London, David (2016). "Rare-Element Granitic Pegmatites". Rare Earth and Critical Elements in Ore Deposits. doi:10.5382/Rev.18.08. ISBN9781629490922.
Jahns, Richard H.; Ewing, Rodney C. (1976). "The Harding Mine Taos County New Mexico"(PDF). New Mexico Geological Society Field Conference Series. 27: 263. Archived(PDF) from the original on 2022-10-09.
Linnen, Robert; Trueman, David L.; Burt, Richard (2014). "Tantalum and niobium". Critical metals handbook(PDF). pp. 361–384. Archived(PDF) from the original on 2022-10-09. Retrieved 29 July 2022.
Melcher, F.; Graupner, T.; Oberthür, T.; Schütte, P. (1 March 2017). "Tantalum-(niobium-tin) mineralisation in pegmatites and rare-metal granites of Africa". South African Journal of Geology. 120 (1): 77–100. Bibcode:2017SAJG..120...77M. doi:10.25131/gssajg.120.1.77.
Linnen, Robert; Trueman, David L.; Burt, Richard (2014). "Tantalum and niobium". Critical metals handbook(PDF). pp. 361–384. Archived(PDF) from the original on 2022-10-09. Retrieved 29 July 2022.
Jahns, Richard H.; Ewing, Rodney C. (1976). "The Harding Mine Taos County New Mexico"(PDF). New Mexico Geological Society Field Conference Series. 27: 263. Archived(PDF) from the original on 2022-10-09.