peoplepill.com. «About Yosef Qafih: Rabbi (1917 - 2000) | Biography, Facts, Career, Wiki, Life». peoplepill.com (em inglês). Consultado em 20 de setembro de 2021 «In 1927, Yosef helped his grandfather retrieve the oldest complete Mishnah commentary from the Jewish community's genizah in Sana'a, containing Rabbi Nathan ben Abraham's elucidation of hard words and passages in the Mishnah»
