| APA | OPOL. (2012, February 15). In Acronym Geek. Retrieved 04:11, February 15, 2012, from http://www.acronymgeek.com/OPOL |
| MLA | "OPOL." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/OPOL>. |
| MHRA | 'OPOL', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/OPOL> [accessed 15 February 2012] |
| Chicago | "OPOL", http://www.acronymgeek.com/OPOL (accessed February 15, 2012). |
| CBE/CSE | OPOL [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/OPOL. |
| Bluebook | OPOL, http://www.acronymgeek.com/OPOL (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPOL, http://www.acronymgeek.com/OPOL (optional description here) (as of Feb. 15, 2012, 04:11). |
| AMA | OPOL. Acronym Geek. February 15, 2012, 04:11. Available at: http://www.acronymgeek.com/OPOL. Accessed February 15, 2012, 04:11. |