Trees in the Koran and the Bible, L. J. Musselman, Unasylva: an international journal of forestry and forest industries, #213: Perceptions of forests (54, #2, 2003).
irfi.org
Farooqi, M.I.H. "Zaqqum in light of the Quran". Islamic Research Foundation International, Inc. สืบค้นเมื่อ 30 December 2014.
