Mann, Vivian B., "Observations on the Biblical Miniatures in Spanish Haggadot", p.167, in Exodus in the Jewish Experience: Echoes and Reverberations, Editors, Pamela Barmash, W. David Nelson, 2015, Lexington Books, ISBN1-4985-0293-8, 978-1498502931, google books
Bazak, Rav Amnon. "The Four Sons". Israel Koschitzky Virtual Beit Midrash. David Silverberg (trans.). Alon Shvut, Israel: Yeshivat Har Etzion. Archived from the original on 18 May 2013. Retrieved 12 March 2013.
Bazak, Rav Amnon. "The Four Sons". Israel Koschitzky Virtual Beit Midrash. David Silverberg (trans.). Alon Shvut, Israel: Yeshivat Har Etzion. Archived from the original on 18 May 2013. Retrieved 12 March 2013.