Gusmian, I. ., and M. . Abdullah. “Knowledge Transmission and Kyai-Santri Network in Pesantren in Java Island During the 20th Century: A Study on Popongan Manuscript”. Afkar: Jurnal Akidah &Amp; Pemikiran Islam, vol. 24, no. 1, June 2022, pp. 159-90, doi:10.22452/afkar.vol24no1.5.