| APA | OTP. (2012, February 15). In Acronym Geek. Retrieved 03:28, February 15, 2012, from http://www.acronymgeek.com/OTP |
| MLA | "OTP." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/OTP>. |
| MHRA | 'OTP', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/OTP> [accessed 15 February 2012] |
| Chicago | "OTP", http://www.acronymgeek.com/OTP (accessed February 15, 2012). |
| CBE/CSE | OTP [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/OTP. |
| Bluebook | OTP, http://www.acronymgeek.com/OTP (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OTP, http://www.acronymgeek.com/OTP (optional description here) (as of Feb. 15, 2012, 03:28). |
| AMA | OTP. Acronym Geek. February 15, 2012, 03:28. Available at: http://www.acronymgeek.com/OTP. Accessed February 15, 2012, 03:28. |