| APA | EV21. (2012, February 10). In Acronym Geek. Retrieved 09:59, February 10, 2012, from http://www.acronymgeek.com/EV21 |
| MLA | "EV21." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/EV21>. |
| MHRA | 'EV21', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/EV21> [accessed 10 February 2012] |
| Chicago | "EV21", http://www.acronymgeek.com/EV21 (accessed February 10, 2012). |
| CBE/CSE | EV21 [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/EV21. |
| Bluebook | EV21, http://www.acronymgeek.com/EV21 (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, EV21, http://www.acronymgeek.com/EV21 (optional description here) (as of Feb. 10, 2012, 09:59). |
| AMA | EV21. Acronym Geek. February 10, 2012, 09:59. Available at: http://www.acronymgeek.com/EV21. Accessed February 10, 2012, 09:59. |