| APA | IGEI. (2012, February 15). In Acronym Geek. Retrieved 00:54, February 15, 2012, from http://www.acronymgeek.com/IGEI |
| MLA | "IGEI." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/IGEI>. |
| MHRA | 'IGEI', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/IGEI> [accessed 15 February 2012] |
| Chicago | "IGEI", http://www.acronymgeek.com/IGEI (accessed February 15, 2012). |
| CBE/CSE | IGEI [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/IGEI. |
| Bluebook | IGEI, http://www.acronymgeek.com/IGEI (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, IGEI, http://www.acronymgeek.com/IGEI (optional description here) (as of Feb. 15, 2012, 00:54). |
| AMA | IGEI. Acronym Geek. February 15, 2012, 00:54. Available at: http://www.acronymgeek.com/IGEI. Accessed February 15, 2012, 00:54. |