Geffen, Louis (1988). "Biography of Tobias Geffen". In Joel David Ziff (ed.). Lev Tuviah: On the Life and Work of Rabbi Tobias Geffen. Newton, Mass.: Rabbi Tobias Geffen Memorial Fund. OCLC18496402.
Geffen, Louis (1988). "Biography of Tobias Geffen". In Joel David Ziff (ed.). Lev Tuviah: On the Life and Work of Rabbi Tobias Geffen. Newton, Mass.: Rabbi Tobias Geffen Memorial Fund. OCLC18496402.