| APA | ETUO. (2012, February 16). In Acronym Geek. Retrieved 07:49, February 16, 2012, from http://www.acronymgeek.com/ETUO |
| MLA | "ETUO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/ETUO>. |
| MHRA | 'ETUO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/ETUO> [accessed 16 February 2012] |
| Chicago | "ETUO", http://www.acronymgeek.com/ETUO (accessed February 16, 2012). |
| CBE/CSE | ETUO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/ETUO. |
| Bluebook | ETUO, http://www.acronymgeek.com/ETUO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ETUO, http://www.acronymgeek.com/ETUO (optional description here) (as of Feb. 16, 2012, 07:49). |
| AMA | ETUO. Acronym Geek. February 16, 2012, 07:49. Available at: http://www.acronymgeek.com/ETUO. Accessed February 16, 2012, 07:49. |