Vũ Thị Kiều, T. “The Ability of Using Language of 5-6 Years Old Children in the Preparation of Enrolling Grade 1 at Primary Schools”. SCIENTIFIC JOURNAL OF TAN TRAO UNIVERSITY, vol. 4, no. 8, Apr. 2021, pp. 120-4, doi:10.51453/2354-1431/2018/193.