Fajans, Kasimir. Die radioaktiven Umwandlungen und das periodische System der Elemente. Berichte der deutschen chemischen Gesellschaft. 1913, 46: 422. doi:10.1002/cber.19130460162.
Peppard, D. F.; Mason, G. W.; Gray, P. R.; Mech, J. F. Journal of the American Chemical Society. 1952, 74 (23): 6081. doi:10.1021/ja01143a074.缺少或|title=为空 (帮助)
Dabos, S.; Dufour, C.; Benedict, U.; Pagès, M. Bulk modulus and P–V relationship up to 52 GPa of neptunium metal at room temperature. Journal of Magnetism and Magnetic Materials. 1987, 63–64: 661–3. Bibcode:1987JMMM...63..661D. doi:10.1016/0304-8853(87)90697-4.
Lee, J; Mardon, P; Pearce, J; Hall, R. Some physical properties of neptunium metal IIA study of the allotropic transformations in neptunium. Journal of Physics and Chemistry of Solids. 1959, 11 (3–4): 177. Bibcode:1959JPCS...11..177L. doi:10.1016/0022-3697(59)90211-2.
Lange, R; Carroll, W. Review of recent advances of radioisotope power systems. Energy Conversion and Management. 2008, 49 (3): 393–401. doi:10.1016/j.enconman.2007.10.028.
Rodriguez, C; Baxter, A.; McEachern, D.; Fikani, M.; Venneri, F. Deep-Burn: making nuclear waste transmutation practical. Nuclear Engineering and Design. 2003, 222 (2–3): 299. doi:10.1016/S0029-5493(03)00034-7.
Burney, G. A; Harbour, R. M; Subcommittee On Radiochemistry, National Research Council (U.S.); Technical Information Center, U.S. Atomic Energy Commission. Radiochemistry of neptunium. 1974 [2013-05-26]. (原始内容存档于2015-04-15).
Dabos, S.; Dufour, C.; Benedict, U.; Pagès, M. Bulk modulus and P–V relationship up to 52 GPa of neptunium metal at room temperature. Journal of Magnetism and Magnetic Materials. 1987, 63–64: 661–3. Bibcode:1987JMMM...63..661D. doi:10.1016/0304-8853(87)90697-4.
Lee, J; Mardon, P; Pearce, J; Hall, R. Some physical properties of neptunium metal IIA study of the allotropic transformations in neptunium. Journal of Physics and Chemistry of Solids. 1959, 11 (3–4): 177. Bibcode:1959JPCS...11..177L. doi:10.1016/0022-3697(59)90211-2.
Burney, G. A; Harbour, R. M; Subcommittee On Radiochemistry, National Research Council (U.S.); Technical Information Center, U.S. Atomic Energy Commission. Radiochemistry of neptunium. 1974 [2013-05-26]. (原始内容存档于2015-04-15).