http://www.dailywritingtips.com/comma-after-i-e-and-e-g/ https://jakubmarian.com/comma-after-i-e-and-e-g/ https://www.grammarly.com/blog/know-your-latin-i-e-vs-e-g/ http://english.stackexchange.com/questions/6894/should-there-be-a-comma-after-i-e