Dawson, D. W. (November 1978). "DDO photometry of giants in four southern open clusters". Astronomical Journal. 83: 1424–1429. Bibcode:1978AJ.....83.1424D. doi:10.1086/112334.
Bruck, Mary T.; et al. (1968). "Three-colour photometry of southern galactic clusters IV: NGC 5822, 5823". Publications of the Royal Observatory, Edinburgh. 6 (9): 209–223. Bibcode:1968PROE....6..210B.
Dawson, D. W. (November 1978). "DDO photometry of giants in four southern open clusters". Astronomical Journal. 83: 1424–1429. Bibcode:1978AJ.....83.1424D. doi:10.1086/112334.