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James W. Christy & Robert S. Harrington (agosto de 1978). «The Satellite of Pluto». Astronomical Journal. 83 (8): 1005–1008. Bibcode:1978AJ.....83.1005C. doi:10.1086/112284
Marc W. Buie; William M. Grundy & Eliot F. Young (julho de 2006). «Orbits and photometry of Pluto's satellites: Charon, S/2005 P1, and S/2005 P2». Astronomical Journal. 132 (1): 290–298. Bibcode:2006AJ....132..290B. arXiv:astro-ph/0512491. doi:10.1086/504422
Brady, Joseph L. (1972). «The Effect of a Trans-Plutonian Planet on Halley's Comet». Publications of the Astronomical Society of the Pacific. 84 (498): 314–322. Bibcode:1972PASP...84..314B. doi:10.1086/129290
J. R. Houck, D. P. Schneider, D. E. Danielson, et al. (1985). «Unidentified IRAS sources: Ultra-High Luminosity Galaxies». The Astrophysical Journal. 290: 5–8. Bibcode:1985ApJ...290L...5H. doi:10.1086/184431
A. A. Jackson & R. M. Killen (1988). «Planet X and the stability of resonances in the Neptune-Pluto system». Monthly Notices of the Royal Astronomical Society. 235: 593–601. Bibcode:1988MNRAS.235..593J. doi:10.1093/mnras/235.2.593
Myles Standish (16 de julho de 1992). «Planet X – No dynamical evidence in the optical observations». Astronomical Journal. 105 (5): 200–2006. Bibcode:1993AJ....105.2000S. doi:10.1086/116575
A. Brunini & M. D. Melita (2002). «The Existence of a Planet beyond 50 AU and the Orbital Distribution of the Classical Edgeworth–Kuiper-Belt Objects». Icarus. 160 (1): 32–43. Bibcode:2002Icar..160...32B. doi:10.1006/icar.2002.6935
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JG Chhabra; SD Sharma; M Khanna (1984). «Prediction of Pluto by V. P. Ketakar»(PDF). Indian Journal of the History of Science. 19 (1): 18–26. Consultado em 4 de setembro de 2008. Arquivado do original(PDF) em 25 de fevereiro de 2009
J. K. Davies; J. McFarland; M. E. Bailey; B. G. Marsden; et al. (2008). «The Early Development of Ideas Concerning the Transneptunian Region». In: M. Antonietta Baracci; Hermann Boenhardt; Dale Cruikchank; Alissandro Morbidelli. The Solar System Beyond Neptune(PDF). [S.l.]: University of Arizona Press. pp. 11–23. Consultado em 6 de março de 2016. Arquivado do original(PDF) em 20 de fevereiro de 2015
Central Bureau for Astronomical Telegrams, International Astronomical Union (2006). «Circular No. 8747»(PDF). Consultado em 5 de julho de 2011. Arquivado do original em 5 de fevereiro de 2007