Böcek Topcu, G.; Afşar, M.; Sneden, C. (21 November 2016). ”The chemical compositions and evolutionary status of red giants in the open cluster NGC 6940”. Monthly Notices of the Royal Astronomical Society 463 (1): sid. 580–597. doi:10.1093/mnras/stw1974. Bibcode: 2016MNRAS.463..580B.
Rose, Michael B.; Hintz, Eric G. (November 2007). ”A Search for Low-Amplitude Variability in Six Open Clusters Using the Robust Median Statistic”. The Astronomical Journal 134 (5): sid. 2067–2078. doi:10.1086/522963. Bibcode: 2007AJ....134.2067R.
Böcek Topcu, G.; Afşar, M.; Sneden, C. (21 November 2016). ”The chemical compositions and evolutionary status of red giants in the open cluster NGC 6940”. Monthly Notices of the Royal Astronomical Society 463 (1): sid. 580–597. doi:10.1093/mnras/stw1974. Bibcode: 2016MNRAS.463..580B.
Rose, Michael B.; Hintz, Eric G. (November 2007). ”A Search for Low-Amplitude Variability in Six Open Clusters Using the Robust Median Statistic”. The Astronomical Journal 134 (5): sid. 2067–2078. doi:10.1086/522963. Bibcode: 2007AJ....134.2067R.