| Style | Reference Text |
|---|
| APA | OPK. (2012, May 27). In All Acronyms. Retrieved 02:59, May 27, 2012, from http://www.all-acronyms.com/OPK |
| MLA | "OPK." All Acronyms. 27 May 2012, 02:59. All Acronyms. 27 May 2012 <http://www.all-acronyms.com/OPK>. |
| MHRA | 'OPK', All Acronyms, 27 May 2012, 02:59, <http://www.all-acronyms.com/OPK> [accessed 27 May 2012] |
| Chicago | "OPK," http://www.all-acronyms.com/OPK (accessed May 27, 2012). |
| CBE/CSE | OPK [Internet]. All Acronyms; 2012 May 27, 02:59 [cited 2012 May 27]. Available from: http://www.all-acronyms.com/OPK. |
| Bluebook | OPK, http://www.all-acronyms.com/OPK (last visited May 27, 2012). |
| Bluebook: Harvard JOLT | See All Acronyms, OPK, http://www.all-acronyms.com/OPK (optional description here) (as of May. 27, 2012, 02:59). |
| AMA | OPK. All Acronyms. May 27, 2012, 02:59. Available at: http://www.all-acronyms.com/OPK. Accessed May 27, 2012. |
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