| APA | ECHO. (2012, February 16). In Acronym Geek. Retrieved 08:01, February 16, 2012, from http://www.acronymgeek.com/ECHO |
| MLA | "ECHO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/ECHO>. |
| MHRA | 'ECHO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/ECHO> [accessed 16 February 2012] |
| Chicago | "ECHO", http://www.acronymgeek.com/ECHO (accessed February 16, 2012). |
| CBE/CSE | ECHO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/ECHO. |
| Bluebook | ECHO, http://www.acronymgeek.com/ECHO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ECHO, http://www.acronymgeek.com/ECHO (optional description here) (as of Feb. 16, 2012, 08:01). |
| AMA | ECHO. Acronym Geek. February 16, 2012, 08:01. Available at: http://www.acronymgeek.com/ECHO. Accessed February 16, 2012, 08:01. |