| APA | OTRA. (2012, February 15). In Acronym Geek. Retrieved 10:09, February 15, 2012, from http://www.acronymgeek.com/OTRA |
| MLA | "OTRA." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/OTRA>. |
| MHRA | 'OTRA', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/OTRA> [accessed 15 February 2012] |
| Chicago | "OTRA", http://www.acronymgeek.com/OTRA (accessed February 15, 2012). |
| CBE/CSE | OTRA [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/OTRA. |
| Bluebook | OTRA, http://www.acronymgeek.com/OTRA (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OTRA, http://www.acronymgeek.com/OTRA (optional description here) (as of Feb. 15, 2012, 10:09). |
| AMA | OTRA. Acronym Geek. February 15, 2012, 10:09. Available at: http://www.acronymgeek.com/OTRA. Accessed February 15, 2012, 10:09. |