TURNER, E. G. Notes on Trigonometry. The Journal of the Indian Mathematical Society, [S. l.], v. 4, n. 5, p. 171–173, 1912. DOI: 10.18311/jims/1912/17767. Disponível em: https://informaticsjournals.com/index.php/jims/article/view/17767. Acesso em: 23 jul. 2024.