| APA | OTOP. (2012, February 16). In Acronym Geek. Retrieved 07:57, February 16, 2012, from http://www.acronymgeek.com/OTOP |
| MLA | "OTOP." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/OTOP>. |
| MHRA | 'OTOP', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/OTOP> [accessed 16 February 2012] |
| Chicago | "OTOP", http://www.acronymgeek.com/OTOP (accessed February 16, 2012). |
| CBE/CSE | OTOP [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/OTOP. |
| Bluebook | OTOP, http://www.acronymgeek.com/OTOP (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OTOP, http://www.acronymgeek.com/OTOP (optional description here) (as of Feb. 16, 2012, 07:57). |
| AMA | OTOP. Acronym Geek. February 16, 2012, 07:57. Available at: http://www.acronymgeek.com/OTOP. Accessed February 16, 2012, 07:57. |