| APA | EFIV. (2012, February 15). In Acronym Geek. Retrieved 16:42, February 15, 2012, from http://www.acronymgeek.com/EFIV |
| MLA | "EFIV." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/EFIV>. |
| MHRA | 'EFIV', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/EFIV> [accessed 15 February 2012] |
| Chicago | "EFIV", http://www.acronymgeek.com/EFIV (accessed February 15, 2012). |
| CBE/CSE | EFIV [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/EFIV. |
| Bluebook | EFIV, http://www.acronymgeek.com/EFIV (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, EFIV, http://www.acronymgeek.com/EFIV (optional description here) (as of Feb. 15, 2012, 16:42). |
| AMA | EFIV. Acronym Geek. February 15, 2012, 16:42. Available at: http://www.acronymgeek.com/EFIV. Accessed February 15, 2012, 16:42. |