| APA | ECOI. (2012, February 15). In Acronym Geek. Retrieved 01:34, February 15, 2012, from http://www.acronymgeek.com/ECOI |
| MLA | "ECOI." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/ECOI>. |
| MHRA | 'ECOI', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/ECOI> [accessed 15 February 2012] |
| Chicago | "ECOI", http://www.acronymgeek.com/ECOI (accessed February 15, 2012). |
| CBE/CSE | ECOI [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/ECOI. |
| Bluebook | ECOI, http://www.acronymgeek.com/ECOI (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ECOI, http://www.acronymgeek.com/ECOI (optional description here) (as of Feb. 15, 2012, 01:34). |
| AMA | ECOI. Acronym Geek. February 15, 2012, 01:34. Available at: http://www.acronymgeek.com/ECOI. Accessed February 15, 2012, 01:34. |