| APA | ZEF. (2012, February 13). In Acronym Geek. Retrieved 21:12, February 13, 2012, from http://www.acronymgeek.com/ZEF |
| MLA | "ZEF." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/ZEF>. |
| MHRA | 'ZEF', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/ZEF> [accessed 13 February 2012] |
| Chicago | "ZEF", http://www.acronymgeek.com/ZEF (accessed February 13, 2012). |
| CBE/CSE | ZEF [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/ZEF. |
| Bluebook | ZEF, http://www.acronymgeek.com/ZEF (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ZEF, http://www.acronymgeek.com/ZEF (optional description here) (as of Feb. 13, 2012, 21:12). |
| AMA | ZEF. Acronym Geek. February 13, 2012, 21:12. Available at: http://www.acronymgeek.com/ZEF. Accessed February 13, 2012, 21:12. |