| APA | OPW. (2012, February 10). In Acronym Geek. Retrieved 16:40, February 10, 2012, from http://www.acronymgeek.com/OPW |
| MLA | "OPW." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/OPW>. |
| MHRA | 'OPW', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/OPW> [accessed 10 February 2012] |
| Chicago | "OPW", http://www.acronymgeek.com/OPW (accessed February 10, 2012). |
| CBE/CSE | OPW [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/OPW. |
| Bluebook | OPW, http://www.acronymgeek.com/OPW (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPW, http://www.acronymgeek.com/OPW (optional description here) (as of Feb. 10, 2012, 16:40). |
| AMA | OPW. Acronym Geek. February 10, 2012, 16:40. Available at: http://www.acronymgeek.com/OPW. Accessed February 10, 2012, 16:40. |