| APA | SFEN. (2012, February 15). In Acronym Geek. Retrieved 09:33, February 15, 2012, from http://www.acronymgeek.com/SFEN |
| MLA | "SFEN." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/SFEN>. |
| MHRA | 'SFEN', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/SFEN> [accessed 15 February 2012] |
| Chicago | "SFEN", http://www.acronymgeek.com/SFEN (accessed February 15, 2012). |
| CBE/CSE | SFEN [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/SFEN. |
| Bluebook | SFEN, http://www.acronymgeek.com/SFEN (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SFEN, http://www.acronymgeek.com/SFEN (optional description here) (as of Feb. 15, 2012, 09:33). |
| AMA | SFEN. Acronym Geek. February 15, 2012, 09:33. Available at: http://www.acronymgeek.com/SFEN. Accessed February 15, 2012, 09:33. |