Lewin, B. M. (1931). Otzar ha-Gaonim: Thesaurus of the Gaonic Responsa and commentaries ; following the order of the Talmudic Tractates / by B. M. Lewin. The Hebrew Univ. Press Association.

Lewin, Benjamin Manasseh. Otzar Ha-Gaonim: Thesaurus of the Gaonic Responsa and Commentaries ; Following the Order of the Talmudic Tractates / by B. M. Lewin. Jerusalem: The Hebrew Univ. Press Association, 1931.

Lewin, Benjamin Manasseh. Otzar Ha-Gaonim: Thesaurus of the Gaonic Responsa and Commentaries ; Following the Order of the Talmudic Tractates / by B. M. Lewin. The Hebrew Univ. Press Association, 1931.