^"American Express Names Edward P. Gilligan President". Archived from the original on 2013-04-21. Retrieved 2016-09-18.
^"Ed Gilligan, AmEx President, Dies at 55 on Trip From Tokyo". Bloomberg.com. 2015-05-29. Retrieved 2021-04-28.
^"AmEx President Gilligan's Death Said to Be Caused by Clot". Bloomberg.com. 2015-06-01. Retrieved 2021-04-28.
^"American Express Names Edward P. Gilligan President". Archived from the original on 2013-04-21. Retrieved 2016-09-18.
^Segal, David (2015-05-29). "Edward P. Gilligan, American Express Executive, Dies at 55". The New York Times. ISSN 0362-4331. Retrieved 2021-04-28.
^http://people.equilar.com/bio/edward-gilligan-american-express/salary/18312#.V9_xvIgrLMw Archived 2016-09-19 at the Wayback Machine
^"Tales in Possible | Disrupt Possible | American Express President Edward Gilligan & Former Thomson Reuters CEO Thomas Glocer - NYU Stern". www.stern.nyu.edu. Retrieved 2021-04-28.
^"EDWARD GILLIGAN Obituary (1959 - 2015) - New York, NY - New York Times". www.legacy.com. Retrieved 2021-04-28.