| APA | ECUO. (2012, February 14). In Acronym Geek. Retrieved 13:54, February 14, 2012, from http://www.acronymgeek.com/ECUO |
| MLA | "ECUO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/ECUO>. |
| MHRA | 'ECUO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/ECUO> [accessed 14 February 2012] |
| Chicago | "ECUO", http://www.acronymgeek.com/ECUO (accessed February 14, 2012). |
| CBE/CSE | ECUO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/ECUO. |
| Bluebook | ECUO, http://www.acronymgeek.com/ECUO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ECUO, http://www.acronymgeek.com/ECUO (optional description here) (as of Feb. 14, 2012, 13:54). |
| AMA | ECUO. Acronym Geek. February 14, 2012, 13:54. Available at: http://www.acronymgeek.com/ECUO. Accessed February 14, 2012, 13:54. |