Lemaʿan ha-aḥdut ṿe-ha-yiḥud : mishnato ṿe-ḥayaṿ shel mo.h.ṿ.r.r Yitsḥaḳ ben mo.h.r.r. Moshe Una zatsal - Unna, Isak (Hotsaʼat Ḳiryat Sefer, 1975)