| APA | IEIO. (2012, February 15). In Acronym Geek. Retrieved 12:57, February 15, 2012, from http://www.acronymgeek.com/IEIO |
| MLA | "IEIO." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/IEIO>. |
| MHRA | 'IEIO', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/IEIO> [accessed 15 February 2012] |
| Chicago | "IEIO", http://www.acronymgeek.com/IEIO (accessed February 15, 2012). |
| CBE/CSE | IEIO [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/IEIO. |
| Bluebook | IEIO, http://www.acronymgeek.com/IEIO (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, IEIO, http://www.acronymgeek.com/IEIO (optional description here) (as of Feb. 15, 2012, 12:57). |
| AMA | IEIO. Acronym Geek. February 15, 2012, 12:57. Available at: http://www.acronymgeek.com/IEIO. Accessed February 15, 2012, 12:57. |