Antropova, Lyudmila I., Tatiana Yu. Zalavina, Liliya S. Polyakova, y Yuliya V. Yuzhakova. «Extralinguistic Conditions of Language Variability in National Languages». Revista Amazonia Investiga 9, no. 25 (enero 25, 2020): 266–273. Accedido febrero 23, 2026. https://www.amazoniainvestiga.info/index.php/amazonia/article/view/887.