J., Erdenebat. “Хялбар англи хэл, англи хэлний үйл үгийн цаг: Easy English ‘English Verb tenses’”. Mongolian Journal of Foreign Languages and Cultures 18, no. 410 (May 2, 2023): 95–99. Accessed January 11, 2025. https://journal.num.edu.mn/JOFLAC/article/view/4267.