Li, Bingjun, Yaqiong Luo, and Haoxin Luo. “A Study on the Trend of Global Language Development”. Journal of Progressive Research in Mathematics 13, no. 3 (May 8, 2018): 2311-2315. Accessed May 8, 2024. http://scitecresearch.com/journals/index.php/jprm/article/view/1500.