(en) Jessie L. Christiansen, Ian J. M. Crossfield, Geert Barentsen, Chris J. Lintott, Thomas Barclay, Brooke D. Simmons, Erik Petigura, Joshua E. Schlieder, Courtney D. Dressing, Andrew Vanderburg, Campbel Allen, Adam McMaster, Grant Miller, Martin Veldthuis, Sarah Allen, Zach Wolfenbarger, Brian Cox, Julia Zemiro, Andrew W. Howard, John Livingston, Evan Sinukoff, Timothy Catron, Andrew Grey, Joshua J. E. Kusch, Ivan Terentev, Martin Vales et Martti H. Kristiansen, « The K2-138 System: A Near-Resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists », The Astronomical Journal, vol. 155, no 2, , p. 9, article no A57 (DOI10.3847/1538-3881/aa9be0, Bibcode2018AJ....155...57C, arXiv1801.03874)
(en) Jessie L. Christiansen, Ian J. M. Crossfield, Geert Barentsen, Chris J. Lintott, Thomas Barclay, Brooke D. Simmons, Erik Petigura, Joshua E. Schlieder, Courtney D. Dressing, Andrew Vanderburg, Campbel Allen, Adam McMaster, Grant Miller, Martin Veldthuis, Sarah Allen, Zach Wolfenbarger, Brian Cox, Julia Zemiro, Andrew W. Howard, John Livingston, Evan Sinukoff, Timothy Catron, Andrew Grey, Joshua J. E. Kusch, Ivan Terentev, Martin Vales et Martti H. Kristiansen, « The K2-138 System: A Near-Resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists », The Astronomical Journal, vol. 155, no 2, , p. 9, article no A57 (DOI10.3847/1538-3881/aa9be0, Bibcode2018AJ....155...57C, arXiv1801.03874)
(en) Jessie L. Christiansen, Ian J. M. Crossfield, Geert Barentsen, Chris J. Lintott, Thomas Barclay, Brooke D. Simmons, Erik Petigura, Joshua E. Schlieder, Courtney D. Dressing, Andrew Vanderburg, Campbel Allen, Adam McMaster, Grant Miller, Martin Veldthuis, Sarah Allen, Zach Wolfenbarger, Brian Cox, Julia Zemiro, Andrew W. Howard, John Livingston, Evan Sinukoff, Timothy Catron, Andrew Grey, Joshua J. E. Kusch, Ivan Terentev, Martin Vales et Martti H. Kristiansen, « The K2-138 System: A Near-Resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists », The Astronomical Journal, vol. 155, no 2, , p. 9, article no A57 (DOI10.3847/1538-3881/aa9be0, Bibcode2018AJ....155...57C, arXiv1801.03874)