R. Oktarina, A. Ambiyar, M. Giatman, F. Fadhilah, M. Muskhir, and H. Effendi, “The Effect of The Use of Multimedia Flip Book with the Flipped Classroom Approach in Vocational School”, J. Educ. Technol., vol. 5, no. 1, pp. 159–166, Apr. 2021.