"Yidishe geviyas-eydes in di shayles ve-tshuves fun onheyb XV bizn sof XVII y'h [Yiddish Testimony in the Responsa Literature from the Beginning of the XV Century until the End of the XVII Century]"Shriften fun Yidishn Visnshaftlekhn Institut, hist. sekt.: historishe shriftn. 1, 1929, pp. 117-196.
