CHAZAN, Robert. 1992. The Letter of R. Jacob Ben Elijah to Friar Paul. In: Jewish History, Vol. 6, No. 1/2, The Frank Talmage Memorial Volume, s. 51-63 [online]. Dostupné na internete <http://www.jstor.org/stable/20101119>.
CHAZAN, Robert. 1992. The Letter of R. Jacob Ben Elijah to Friar Paul. In: Jewish History, Vol. 6, No. 1/2, The Frank Talmage Memorial Volume, s. 51-63 [online]. Dostupné na internete <http://www.jstor.org/stable/20101119>.