| APA | EFO. (2012, February 14). In Acronym Geek. Retrieved 20:35, February 14, 2012, from http://www.acronymgeek.com/EFO |
| MLA | "EFO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/EFO>. |
| MHRA | 'EFO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/EFO> [accessed 14 February 2012] |
| Chicago | "EFO", http://www.acronymgeek.com/EFO (accessed February 14, 2012). |
| CBE/CSE | EFO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/EFO. |
| Bluebook | EFO, http://www.acronymgeek.com/EFO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, EFO, http://www.acronymgeek.com/EFO (optional description here) (as of Feb. 14, 2012, 20:35). |
| AMA | EFO. Acronym Geek. February 14, 2012, 20:35. Available at: http://www.acronymgeek.com/EFO. Accessed February 14, 2012, 20:35. |