| APA | ECA. (2012, February 13). In Acronym Geek. Retrieved 23:15, February 13, 2012, from http://www.acronymgeek.com/ECA |
| MLA | "ECA." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/ECA>. |
| MHRA | 'ECA', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/ECA> [accessed 13 February 2012] |
| Chicago | "ECA", http://www.acronymgeek.com/ECA (accessed February 13, 2012). |
| CBE/CSE | ECA [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/ECA. |
| Bluebook | ECA, http://www.acronymgeek.com/ECA (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ECA, http://www.acronymgeek.com/ECA (optional description here) (as of Feb. 13, 2012, 23:15). |
| AMA | ECA. Acronym Geek. February 13, 2012, 23:15. Available at: http://www.acronymgeek.com/ECA. Accessed February 13, 2012, 23:15. |