Turgut, S., H. Kılınç, G. B. Eyüpoglu, and B. Bağış. “Color Relationships of Natural Anterior Teeth: An <i>In vivo</i> Study”. Nigerian Journal of Clinical Practice, vol. 21, no. 7, July 2018, pp. 925-31, doi:10.4103/njcp.njcp_361_17.