| APA | OTR. (2012, February 9). In Acronym Geek. Retrieved 20:46, February 9, 2012, from http://www.acronymgeek.com/OTR |
| MLA | "OTR." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/OTR>. |
| MHRA | 'OTR', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/OTR> [accessed 9 February 2012] |
| Chicago | "OTR", http://www.acronymgeek.com/OTR (accessed February 9, 2012). |
| CBE/CSE | OTR [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/OTR. |
| Bluebook | OTR, http://www.acronymgeek.com/OTR (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OTR, http://www.acronymgeek.com/OTR (optional description here) (as of Feb. 9, 2012, 20:46). |
| AMA | OTR. Acronym Geek. February 9, 2012, 20:46. Available at: http://www.acronymgeek.com/OTR. Accessed February 9, 2012, 20:46. |