| APA | EXTF. (2012, February 15). In Acronym Geek. Retrieved 05:50, February 15, 2012, from http://www.acronymgeek.com/EXTF |
| MLA | "EXTF." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/EXTF>. |
| MHRA | 'EXTF', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/EXTF> [accessed 15 February 2012] |
| Chicago | "EXTF", http://www.acronymgeek.com/EXTF (accessed February 15, 2012). |
| CBE/CSE | EXTF [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/EXTF. |
| Bluebook | EXTF, http://www.acronymgeek.com/EXTF (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, EXTF, http://www.acronymgeek.com/EXTF (optional description here) (as of Feb. 15, 2012, 05:50). |
| AMA | EXTF. Acronym Geek. February 15, 2012, 05:50. Available at: http://www.acronymgeek.com/EXTF. Accessed February 15, 2012, 05:50. |