| APA | ECYO. (2012, February 16). In Acronym Geek. Retrieved 03:40, February 16, 2012, from http://www.acronymgeek.com/ECYO |
| MLA | "ECYO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/ECYO>. |
| MHRA | 'ECYO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/ECYO> [accessed 16 February 2012] |
| Chicago | "ECYO", http://www.acronymgeek.com/ECYO (accessed February 16, 2012). |
| CBE/CSE | ECYO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/ECYO. |
| Bluebook | ECYO, http://www.acronymgeek.com/ECYO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ECYO, http://www.acronymgeek.com/ECYO (optional description here) (as of Feb. 16, 2012, 03:40). |
| AMA | ECYO. Acronym Geek. February 16, 2012, 03:40. Available at: http://www.acronymgeek.com/ECYO. Accessed February 16, 2012, 03:40. |