| APA | EFN. (2012, February 10). In Acronym Geek. Retrieved 11:12, February 10, 2012, from http://www.acronymgeek.com/EFN |
| MLA | "EFN." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/EFN>. |
| MHRA | 'EFN', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/EFN> [accessed 10 February 2012] |
| Chicago | "EFN", http://www.acronymgeek.com/EFN (accessed February 10, 2012). |
| CBE/CSE | EFN [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/EFN. |
| Bluebook | EFN, http://www.acronymgeek.com/EFN (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, EFN, http://www.acronymgeek.com/EFN (optional description here) (as of Feb. 10, 2012, 11:12). |
| AMA | EFN. Acronym Geek. February 10, 2012, 11:12. Available at: http://www.acronymgeek.com/EFN. Accessed February 10, 2012, 11:12. |