S. F. Rajagukguk, K. T. Sipayung, A. N. Pasaribu, and E. Sinambela, “Teachers’ creativity in designing English teaching learning material by prajabatan student Program Profesi Guru (PPG) batch II”, Inov. Curr, vol. 21, no. 1, pp. 125–136, Feb. 2024, doi: 10.17509/jik.v21i1.63383.