https://www.eislamicbook.com/ijra-e-usool-e-hadith-by-maulana-abdullah-bin-muhammad-lajpuri-%d8%a7%d8%ac%d8%b1%d8%a7%d8%a6%db%92-%d8%a7%d8%b5%d9%88%d9%84-%d8%ad%d8%af%db%8c%d8%ab/