| APA | OPWU. (2012, February 16). In Acronym Geek. Retrieved 04:05, February 16, 2012, from http://www.acronymgeek.com/OPWU |
| MLA | "OPWU." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/OPWU>. |
| MHRA | 'OPWU', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/OPWU> [accessed 16 February 2012] |
| Chicago | "OPWU", http://www.acronymgeek.com/OPWU (accessed February 16, 2012). |
| CBE/CSE | OPWU [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/OPWU. |
| Bluebook | OPWU, http://www.acronymgeek.com/OPWU (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPWU, http://www.acronymgeek.com/OPWU (optional description here) (as of Feb. 16, 2012, 04:05). |
| AMA | OPWU. Acronym Geek. February 16, 2012, 04:05. Available at: http://www.acronymgeek.com/OPWU. Accessed February 16, 2012, 04:05. |