| APA | EC4A. (2012, February 16). In Acronym Geek. Retrieved 04:53, February 16, 2012, from http://www.acronymgeek.com/EC4A |
| MLA | "EC4A." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/EC4A>. |
| MHRA | 'EC4A', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/EC4A> [accessed 16 February 2012] |
| Chicago | "EC4A", http://www.acronymgeek.com/EC4A (accessed February 16, 2012). |
| CBE/CSE | EC4A [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/EC4A. |
| Bluebook | EC4A, http://www.acronymgeek.com/EC4A (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, EC4A, http://www.acronymgeek.com/EC4A (optional description here) (as of Feb. 16, 2012, 04:53). |
| AMA | EC4A. Acronym Geek. February 16, 2012, 04:53. Available at: http://www.acronymgeek.com/EC4A. Accessed February 16, 2012, 04:53. |