FOSTER, T.; BRUNT, C. M. A CGPS Look at the Spiral Structure of the Outer Milky Way. I. Distances and Velocities to Star-forming Regions. S. 147. Astronomical Journal [online]. Listopad 2015 [cit. 2020-01-21]. Roč. 150, čís. 5, s. 147. Dostupné online. DOI10.1088/0004-6256/150/5/147. Bibcode2015AJ....150..147F. (anglicky)
PANDEY, A. K.; ESWARAIAH, C.; SHARMA, Saurabh, et al. Optical Photometric and Polarimetric Investigation of NGC 1931. S. 172. Astrophysical Journal [online]. Únor 2013 [cit. 2020-01-21]. Roč. 764, s. 172. Dostupné online. DOI10.1088/0004-637X/764/2/172. Bibcode2013ApJ...764..172P. (anglicky)
harvard.edu
ui.adsabs.harvard.edu
FOSTER, T.; BRUNT, C. M. A CGPS Look at the Spiral Structure of the Outer Milky Way. I. Distances and Velocities to Star-forming Regions. S. 147. Astronomical Journal [online]. Listopad 2015 [cit. 2020-01-21]. Roč. 150, čís. 5, s. 147. Dostupné online. DOI10.1088/0004-6256/150/5/147. Bibcode2015AJ....150..147F. (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. 2020-01-21]. Čís. 2, s. B1-B46. Dostupné online. Bibcode1931AnLun...2....1C. (anglicky)
PANDEY, A. K.; ESWARAIAH, C.; SHARMA, Saurabh, et al. Optical Photometric and Polarimetric Investigation of NGC 1931. S. 172. Astrophysical Journal [online]. Únor 2013 [cit. 2020-01-21]. Roč. 764, s. 172. Dostupné online. DOI10.1088/0004-637X/764/2/172. Bibcode2013ApJ...764..172P. (anglicky)
adsabs.harvard.edu
FOSTER, T.; BRUNT, C. M. A CGPS Look at the Spiral Structure of the Outer Milky Way. I. Distances and Velocities to Star-forming Regions. S. 147. Astronomical Journal [online]. Listopad 2015 [cit. 2020-01-21]. Roč. 150, čís. 5, s. 147. Dostupné online. DOI10.1088/0004-6256/150/5/147. Bibcode2015AJ....150..147F. (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. 2020-01-21]. Čís. 2, s. B1-B46. Dostupné online. Bibcode1931AnLun...2....1C. (anglicky)
PANDEY, A. K.; ESWARAIAH, C.; SHARMA, Saurabh, et al. Optical Photometric and Polarimetric Investigation of NGC 1931. S. 172. Astrophysical Journal [online]. Únor 2013 [cit. 2020-01-21]. Roč. 764, s. 172. Dostupné online. DOI10.1088/0004-637X/764/2/172. Bibcode2013ApJ...764..172P. (anglicky)
u-strasbg.fr
simbad.u-strasbg.fr
SIMBAD Astronomical Database: Results for NGC 1931 [online]. [cit. 2020-01-21]. Dostupné online. (anglicky)
web.archive.org
FROMMERT, Hartmut. Revised NGC Data for NGC 1931 [online]. SEDS.org [cit. 2020-01-21]. Dostupné v archivu pořízeném dne 2012-09-02. (anglicky)