| APA | OPRP. (2012, February 16). In Acronym Geek. Retrieved 15:15, February 16, 2012, from http://www.acronymgeek.com/OPRP |
| MLA | "OPRP." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/OPRP>. |
| MHRA | 'OPRP', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/OPRP> [accessed 16 February 2012] |
| Chicago | "OPRP", http://www.acronymgeek.com/OPRP (accessed February 16, 2012). |
| CBE/CSE | OPRP [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/OPRP. |
| Bluebook | OPRP, http://www.acronymgeek.com/OPRP (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, OPRP, http://www.acronymgeek.com/OPRP (optional description here) (as of Feb. 16, 2012, 15:15). |
| AMA | OPRP. Acronym Geek. February 16, 2012, 15:15. Available at: http://www.acronymgeek.com/OPRP. Accessed February 16, 2012, 15:15. |