| APA | ETU. (2012, February 14). In Acronym Geek. Retrieved 04:05, February 14, 2012, from http://www.acronymgeek.com/ETU |
| MLA | "ETU." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/ETU>. |
| MHRA | 'ETU', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/ETU> [accessed 14 February 2012] |
| Chicago | "ETU", http://www.acronymgeek.com/ETU (accessed February 14, 2012). |
| CBE/CSE | ETU [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/ETU. |
| Bluebook | ETU, http://www.acronymgeek.com/ETU (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ETU, http://www.acronymgeek.com/ETU (optional description here) (as of Feb. 14, 2012, 04:05). |
| AMA | ETU. Acronym Geek. February 14, 2012, 04:05. Available at: http://www.acronymgeek.com/ETU. Accessed February 14, 2012, 04:05. |