Antropova, Lyudmila, Tatiana Zalavina, Liliya Polyakova, and Yuliya Yuzhakova. “Extralinguistic Conditions of Language Variability in National Languages”. Amazonia Investiga 9, no. 25 (January 25, 2020): 266-273. Accessed April 25, 2024. https://amazoniainvestiga.info/index.php/amazonia/article/view/887.