| APA | OPTS. (2012, February 14). In Acronym Geek. Retrieved 13:19, February 14, 2012, from http://www.acronymgeek.com/OPTS |
| MLA | "OPTS." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/OPTS>. |
| MHRA | 'OPTS', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/OPTS> [accessed 14 February 2012] |
| Chicago | "OPTS", http://www.acronymgeek.com/OPTS (accessed February 14, 2012). |
| CBE/CSE | OPTS [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/OPTS. |
| Bluebook | OPTS, http://www.acronymgeek.com/OPTS (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPTS, http://www.acronymgeek.com/OPTS (optional description here) (as of Feb. 14, 2012, 13:19). |
| AMA | OPTS. Acronym Geek. February 14, 2012, 13:19. Available at: http://www.acronymgeek.com/OPTS. Accessed February 14, 2012, 13:19. |