Schneerson, Rabbi Menachem Mendel. "The Head". Kabbalah and the Mystical. Chabad-Lubavitch Media Center. Archived from the original on 19 June 2013. Retrieved 25 August 2013.
Schneerson, Rabbi Menachem Mendel. "The Head". Kabbalah and the Mystical. Chabad-Lubavitch Media Center. Archived from the original on 19 June 2013. Retrieved 25 August 2013.