El Akkad, Omar (November 22, 2007). "The Irving family tree". The Globe and Main. Archived from the original on February 11, 2023. Retrieved July 2, 2020.
El Akkad, Omar (November 22, 2007). "The Irving family tree". The Globe and Main. Archived from the original on February 11, 2023. Retrieved July 2, 2020.