H. Lê Ngọc, X. Trần Khai, N. H. Phuong, U. P. Long, T. T. Nam, and N. T. Ngan, “Flashcard Design for Helping Students in Learning Chinese Vocabulary”, JWEEP, vol. 3, no. 10, pp. 10–23, Oct. 2021, doi: 10.32996/jweep.2021.3.10.2.