| APA | OPL. (2012, February 15). In Acronym Geek. Retrieved 03:24, February 15, 2012, from http://www.acronymgeek.com/OPL |
| MLA | "OPL." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/OPL>. |
| MHRA | 'OPL', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/OPL> [accessed 15 February 2012] |
| Chicago | "OPL", http://www.acronymgeek.com/OPL (accessed February 15, 2012). |
| CBE/CSE | OPL [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/OPL. |
| Bluebook | OPL, http://www.acronymgeek.com/OPL (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPL, http://www.acronymgeek.com/OPL (optional description here) (as of Feb. 15, 2012, 03:24). |
| AMA | OPL. Acronym Geek. February 15, 2012, 03:24. Available at: http://www.acronymgeek.com/OPL. Accessed February 15, 2012, 03:24. |