The Yiddish Sources website (http://yiddish-sources.com/) features a bibliography with secondary literature in the field of Yiddish Studies: http://yiddish-sources.com/bibliography/. This bibliography was made with Refbase and is compatible with Zotero: when you browse the bibliography with Firefox and the Zotero plug-in enable, Zotero will automatically recognize references in the bibliography which can then easily be added to your Zotero library.