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Books about Isserlein:
Jewish Life in Austria in the Fifteenth Century: As Reflected in the Legal Writings of Israel Isserlein and His... by Shlomo Eidelberg (Oct 15, 2011)
Jewish life in Austria in the XVth century;: As reflected in the legal writings of Rabbi Israel Isserlein and... by Shlomo Eidelberg (1962)
Leket Yosher le-Rav Yoseph Bar Moshe. Kolel minhagim, piske halakhot u-teshuvot shel Rabbo ha-Gaon Ba'al Terumah... by Joseph; Rabbi Jakob Freimann ben Moses (1904)
Wiki information Isserlein:
Israel Isserlin was a Talmudist, and Halakhist, best known for his Terumat HaDeshen, which served as one source for HaMapah, the component of the Shulkhan Arukh by Moses Isserles. He is also known as Israel of Neustadt, Israel of Marpurk, Maharai