BAUMGARDT, H. The nature of some doubtful open clusters as revealed by HIPPARCOS. S. 402–414. Astronomy and Astrophysics [online]. Prosinec 1998 [cit. 2021-02-04]. Roč. 340, s. 402–414. Dostupné online. Bibcode1998A&A...340..402B. (anglicky)
COLLINDER, Per. On Structural Properties of Open Galactic Clusters and their Spatial Distribution. Catalog of Open Galactic Clusters. S. B1-B46. Annals of the Observatory of Lund [online]. 1931 [cit. 2021-02-04]. Čís. 2, s. B1-B46. Dostupné online. Bibcode1931AnLun...2....1C. (anglicky)
HALL, Douglas S.; VANLANDINDHAM, Franklin G. The Nearby Poor Cluster Collinder 399. S. 640. Publications of the Astronomical Society of the Pacific [online]. Červen 1970 [cit. 2021-02-04]. Roč. 82, čís. 487, s. 640. Dostupné online. Bibcode1970PASP...82..640H. (anglicky)
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BAUMGARDT, H. The nature of some doubtful open clusters as revealed by HIPPARCOS. S. 402–414. Astronomy and Astrophysics [online]. Prosinec 1998 [cit. 2021-02-04]. Roč. 340, s. 402–414. Dostupné online. Bibcode1998A&A...340..402B. (anglicky)
COLLINDER, Per. On Structural Properties of Open Galactic Clusters and their Spatial Distribution. Catalog of Open Galactic Clusters. S. B1-B46. Annals of the Observatory of Lund [online]. 1931 [cit. 2021-02-04]. Čís. 2, s. B1-B46. Dostupné online. Bibcode1931AnLun...2....1C. (anglicky)
HALL, Douglas S.; VANLANDINDHAM, Franklin G. The Nearby Poor Cluster Collinder 399. S. 640. Publications of the Astronomical Society of the Pacific [online]. Červen 1970 [cit. 2021-02-04]. Roč. 82, čís. 487, s. 640. Dostupné online. Bibcode1970PASP...82..640H. (anglicky)