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Myasoedov, B. F.; Kirby, H. W.; Tananaev, I. G. (2006). "Chapter 4: Protactinium". Dalam Morss, L. R.; Edelstein, N. M.; Fuger, J. The Chemistry of the Actinide and Transactinide Elements. The Chemistry of the Actinide and Transactinide Elements (edisi ke-3). Dordrecht, Belanda: Springer. Bibcode:2011tcot.book.....M. doi:10.1007/978-94-007-0211-0. ISBN978-1-4020-3555-5.Parameter |s2cid= yang tidak diketahui akan diabaikan (bantuan)
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Brown, D.; Petcher, T. J.; Smith, A. J. (1968). "Crystal Structures of some Protactinium Bromides". Nature. 217 (5130): 737. Bibcode:1968Natur.217..737B. doi:10.1038/217737a0.Parameter |s2cid= yang tidak diketahui akan diabaikan (bantuan)
Iyer, P. N.; Smith, A. J. (1971). "Double oxides containing niobium, tantalum or protactinium. IV. Further systems involving alkali metals". Acta Crystallographica B. 27 (4): 731. doi:10.1107/S056774087100284X.
Iyer, P. N.; Smith, A. J. (1967). "Double oxides containing niobium, tantalum, or protactinium. III. Systems involving the rare earths". Acta Crystallographica. 23 (5): 740. doi:10.1107/S0365110X67003639.
Myasoedov, B. F.; Kirby, H. W.; Tananaev, I. G. (2006). "Chapter 4: Protactinium". Dalam Morss, L. R.; Edelstein, N. M.; Fuger, J. The Chemistry of the Actinide and Transactinide Elements. The Chemistry of the Actinide and Transactinide Elements (edisi ke-3). Dordrecht, Belanda: Springer. Bibcode:2011tcot.book.....M. doi:10.1007/978-94-007-0211-0. ISBN978-1-4020-3555-5.Parameter |s2cid= yang tidak diketahui akan diabaikan (bantuan)
Brown, D.; Petcher, T. J.; Smith, A. J. (1968). "Crystal Structures of some Protactinium Bromides". Nature. 217 (5130): 737. Bibcode:1968Natur.217..737B. doi:10.1038/217737a0.Parameter |s2cid= yang tidak diketahui akan diabaikan (bantuan)