Saputra, Hery, et al. “Sinkronisasi Pembelajaran Karakter Pondok Pesantren Bahrul Ulum Tambakberas Jombang Dalam Menghadapi Perkembangan Revolusi Industri 4.0”. JoEMS (Journal of Education and Management Studies), vol. 5, no. 2, Feb. 2022, pp. 51-55, doi:10.32764/joems.v5i2.685.