Mucciarelli, A.; et al. (September 2023). "The chemical DNA of the Magellanic Clouds. II. High-resolution spectroscopy of the SMC globular clusters NGC 121, NGC 339, and NGC 419". Astronomy & Astrophysics. 677. id. A61. arXiv:2307.03470. Bibcode:2023A&A...677A..61M. doi:10.1051/0004-6361/202347120.
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Mucciarelli, A.; et al. (September 2023). "The chemical DNA of the Magellanic Clouds. II. High-resolution spectroscopy of the SMC globular clusters NGC 121, NGC 339, and NGC 419". Astronomy & Astrophysics. 677. id. A61. arXiv:2307.03470. Bibcode:2023A&A...677A..61M. doi:10.1051/0004-6361/202347120.
Walker, Alistair R.; Mack, Peter (September 1988). "CCD Photometry of the RR Lyrae Stars in NGC 121 and the Distance to the Small Magellanic Cloud". Astronomical Journal. 96: 872. Bibcode:1988AJ.....96..872W. doi:10.1086/114853.
Shara, Michael M.; et al. (December 1998). "Hubble Space Telescope Observations of NGC 121: First Detection of Blue Stragglers in an Extragalactic Globular Cluster". The Astrophysical Journal. 508 (2): 570–575. Bibcode:1998ApJ...508..570S. doi:10.1086/306423.
Glatt, Katharina; et al. (April 2008). "An Accurate Age Determination for the Small Magellanic Cloud Star Cluster NGC 121 with the Hubble Space Telescope/Advanced Camera for Surveys". The Astronomical Journal. 135 (4): 1106–1116. Bibcode:2008AJ....135.1106G. doi:10.1088/0004-6256/135/4/1106.{{cite journal}}: CS1 maint: multiple names: authors list (link)
Mucciarelli, A.; et al. (September 2023). "The chemical DNA of the Magellanic Clouds. II. High-resolution spectroscopy of the SMC globular clusters NGC 121, NGC 339, and NGC 419". Astronomy & Astrophysics. 677. id. A61. arXiv:2307.03470. Bibcode:2023A&A...677A..61M. doi:10.1051/0004-6361/202347120.
Walker, Alistair R.; Mack, Peter (September 1988). "CCD Photometry of the RR Lyrae Stars in NGC 121 and the Distance to the Small Magellanic Cloud". Astronomical Journal. 96: 872. Bibcode:1988AJ.....96..872W. doi:10.1086/114853.