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