Thackeray, A. D.; Wesselink, A. J. (1965). "A photometric and spectroscopic study of the cluster IC 2944". Monthly Notices of the Royal Astronomical Society. Cilt 131. ss. 121-135. Bibcode:1965MNRAS.131..121T. doi:10.1093/mnras/131.1.121.
Thackeray, A. D.; Wesselink, A. J. (1965). "A photometric and spectroscopic study of the cluster IC 2944". Monthly Notices of the Royal Astronomical Society. Cilt 131. ss. 121-135. Bibcode:1965MNRAS.131..121T. doi:10.1093/mnras/131.1.121.