| APA | OPWR. (2012, February 17). In Acronym Geek. Retrieved 07:24, February 17, 2012, from http://www.acronymgeek.com/OPWR |
| MLA | "OPWR." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/OPWR>. |
| MHRA | 'OPWR', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/OPWR> [accessed 17 February 2012] |
| Chicago | "OPWR", http://www.acronymgeek.com/OPWR (accessed February 17, 2012). |
| CBE/CSE | OPWR [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/OPWR. |
| Bluebook | OPWR, http://www.acronymgeek.com/OPWR (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPWR, http://www.acronymgeek.com/OPWR (optional description here) (as of Feb. 17, 2012, 07:24). |
| AMA | OPWR. Acronym Geek. February 17, 2012, 07:24. Available at: http://www.acronymgeek.com/OPWR. Accessed February 17, 2012, 07:24. |