| APA | IEFO. (2012, February 14). In Acronym Geek. Retrieved 21:00, February 14, 2012, from http://www.acronymgeek.com/IEFO |
| MLA | "IEFO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/IEFO>. |
| MHRA | 'IEFO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/IEFO> [accessed 14 February 2012] |
| Chicago | "IEFO", http://www.acronymgeek.com/IEFO (accessed February 14, 2012). |
| CBE/CSE | IEFO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/IEFO. |
| Bluebook | IEFO, http://www.acronymgeek.com/IEFO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, IEFO, http://www.acronymgeek.com/IEFO (optional description here) (as of Feb. 14, 2012, 21:00). |
| AMA | IEFO. Acronym Geek. February 14, 2012, 21:00. Available at: http://www.acronymgeek.com/IEFO. Accessed February 14, 2012, 21:00. |