ANTRANIK A., Sefilian; TOUMA, Jihad R.. Shepherding in a Self-Gravitating Disk of Trans-Neptunian Objects [online]. arxiv.org, 2019, [cit. 2019-01-26]. Dostupné online.
Jakub Scholtz, James Unwin. What if Planet 9 is a Primordial Black Hole? [online]. arxiv.org, [cit. 2020-01-04]. Dostupné online. (po anglicky)
Lorenzo Iorio dubs Planet-X as Thelisto in 2013 [online]. . Dostupné online.
Time To Welcome Planet Nine? Scientists Obtain Substantive Proof [online]. . Dostupné online.
discovermagazine.com
blogs.discovermagazine.com
A Little Perspective on the New “9th Planet” (and the 10th, and the 11th) [online]. [Cit. 2016-01-25]. Dostupné online. Archivované 2016-07-14 z originálu.
doi.org
dx.doi.org
WITZE, Alexandra. Evidence grows for giant planet on fringes of Solar System. Nature, 2016-01-20, s. 266 – 7. DOI: 10.1038/529266a. PMID 26791699.
IORIO, Lorenzo. Planet X revamped after the discovery of the Sedna-like object 2012 VP113?. Monthly Notices of the Royal Astronomical Society, 2014-08-16, s. L78–L79. DOI: 10.1093/mnrasl/slu116.
HAND, Eric. Astronomers say a Neptune-sized planet lurks beyond Pluto. Science, 2016-01-20. Dostupné online.
scientificamerican.com
See embedded video simulation at Michael D. Lemonick; (Worldwide Telescope, Caltech/R. Hurt (IPAC)). Strong Evidence Suggests a Super Earth Lies beyond Pluto [online]. 2016-01-20. Dostupné online.
skyandtelescope.com
BEATTY, Kelly. Making the Case for “Planet Nine” [online]. 2016-01-20. Dostupné online.
space.com
How Astronomers Could Actually See 'Planet Nine' [online]. 2016-01-21, [cit. 2016-01-24]. Dostupné online.
washingtonpost.com
ACHENBACH, Joel; FELTMAN, Rachel. New evidence suggests a ninth planet lurking at the edge of the solar system. The Washington Post, 2016-01-20. Dostupné online. ISSN– 8286 0190 – 8286.
A Little Perspective on the New “9th Planet” (and the 10th, and the 11th) [online]. [Cit. 2016-01-25]. Dostupné online. Archivované 2016-07-14 z originálu.
worldcat.org
ACHENBACH, Joel; FELTMAN, Rachel. New evidence suggests a ninth planet lurking at the edge of the solar system. The Washington Post, 2016-01-20. Dostupné online. ISSN– 8286 0190 – 8286.