| APA | OPWH. (2012, February 15). In Acronym Geek. Retrieved 02:59, February 15, 2012, from http://www.acronymgeek.com/OPWH |
| MLA | "OPWH." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/OPWH>. |
| MHRA | 'OPWH', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/OPWH> [accessed 15 February 2012] |
| Chicago | "OPWH", http://www.acronymgeek.com/OPWH (accessed February 15, 2012). |
| CBE/CSE | OPWH [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/OPWH. |
| Bluebook | OPWH, http://www.acronymgeek.com/OPWH (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPWH, http://www.acronymgeek.com/OPWH (optional description here) (as of Feb. 15, 2012, 02:59). |
| AMA | OPWH. Acronym Geek. February 15, 2012, 02:59. Available at: http://www.acronymgeek.com/OPWH. Accessed February 15, 2012, 02:59. |