Naraniengar, M. T. “The Six-Fold Systems of Similar Circumscribed and Inscribed Triangles of a Given Triangle”. The Journal of the Indian Mathematical Society 4, no. 1 (February 1, 1912): 21–23. Accessed May 1, 2024. https://www.informaticsjournals.com/index.php/jims/article/view/17781.