| APA | EFX. (2012, February 11). In Acronym Geek. Retrieved 18:14, February 11, 2012, from http://www.acronymgeek.com/EFX |
| MLA | "EFX." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/EFX>. |
| MHRA | 'EFX', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/EFX> [accessed 11 February 2012] |
| Chicago | "EFX", http://www.acronymgeek.com/EFX (accessed February 11, 2012). |
| CBE/CSE | EFX [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/EFX. |
| Bluebook | EFX, http://www.acronymgeek.com/EFX (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, EFX, http://www.acronymgeek.com/EFX (optional description here) (as of Feb. 11, 2012, 18:14). |
| AMA | EFX. Acronym Geek. February 11, 2012, 18:14. Available at: http://www.acronymgeek.com/EFX. Accessed February 11, 2012, 18:14. |