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Thackeray, A D; Wesselink, A J; Harding, G A (1962). "The Cluster NGC 6067". Monthly Notices of the Royal Astronomical Society. 124: 445–459. Bibcode:1962MNRAS.124..445T. doi:10.1093/mnras/124.6.445 (inactive 12 July 2025).{{cite journal}}: CS1 maint: DOI inactive as of July 2025 (link)
Thackeray, A D; Wesselink, A J; Harding, G A (1962). "The Cluster NGC 6067". Monthly Notices of the Royal Astronomical Society. 124: 445–459. Bibcode:1962MNRAS.124..445T. doi:10.1093/mnras/124.6.445 (inactive 12 July 2025).{{cite journal}}: CS1 maint: DOI inactive as of July 2025 (link)