| APA | EXSF. (2012, February 15). In Acronym Geek. Retrieved 07:27, February 15, 2012, from http://www.acronymgeek.com/EXSF |
| MLA | "EXSF." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/EXSF>. |
| MHRA | 'EXSF', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/EXSF> [accessed 15 February 2012] |
| Chicago | "EXSF", http://www.acronymgeek.com/EXSF (accessed February 15, 2012). |
| CBE/CSE | EXSF [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/EXSF. |
| Bluebook | EXSF, http://www.acronymgeek.com/EXSF (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, EXSF, http://www.acronymgeek.com/EXSF (optional description here) (as of Feb. 15, 2012, 07:27). |
| AMA | EXSF. Acronym Geek. February 15, 2012, 07:27. Available at: http://www.acronymgeek.com/EXSF. Accessed February 15, 2012, 07:27. |