| APA | OPTZ. (2012, February 15). In Acronym Geek. Retrieved 22:22, February 15, 2012, from http://www.acronymgeek.com/OPTZ |
| MLA | "OPTZ." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/OPTZ>. |
| MHRA | 'OPTZ', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/OPTZ> [accessed 15 February 2012] |
| Chicago | "OPTZ", http://www.acronymgeek.com/OPTZ (accessed February 15, 2012). |
| CBE/CSE | OPTZ [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/OPTZ. |
| Bluebook | OPTZ, http://www.acronymgeek.com/OPTZ (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPTZ, http://www.acronymgeek.com/OPTZ (optional description here) (as of Feb. 15, 2012, 22:22). |
| AMA | OPTZ. Acronym Geek. February 15, 2012, 22:22. Available at: http://www.acronymgeek.com/OPTZ. Accessed February 15, 2012, 22:22. |