| Style | Reference Text |
|---|
| APA | OP. (2013, May 18). In All Acronyms. Retrieved 10:28, May 18, 2013, from http://www.all-acronyms.com/cat/5/OP |
| MLA | "OP." All Acronyms. 18 May 2013, 10:28. All Acronyms. 18 May 2013 <http://www.all-acronyms.com/cat/5/OP>. |
| MHRA | 'OP', All Acronyms, 18 May 2013, 10:28, <http://www.all-acronyms.com/cat/5/OP> [accessed 18 May 2013] |
| Chicago | "OP," http://www.all-acronyms.com/cat/5/OP (accessed May 18, 2013). |
| CBE/CSE | OP [Internet]. All Acronyms; 2013 May 18, 10:28 [cited 2013 May 18]. Available from: http://www.all-acronyms.com/cat/5/OP. |
| Bluebook | OP, http://www.all-acronyms.com/cat/5/OP (last visited May 18, 2013). |
| Bluebook: Harvard JOLT | See All Acronyms, OP, http://www.all-acronyms.com/cat/5/OP (optional description here) (as of May. 18, 2013, 10:28). |
| AMA | OP. All Acronyms. May 18, 2013, 10:28. Available at: http://www.all-acronyms.com/cat/5/OP. Accessed May 18, 2013. |