| APA | PRH. (2012, February 13). In Acronym Geek. Retrieved 23:28, February 13, 2012, from http://www.acronymgeek.com/PRH |
| MLA | "PRH." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/PRH>. |
| MHRA | 'PRH', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/PRH> [accessed 13 February 2012] |
| Chicago | "PRH", http://www.acronymgeek.com/PRH (accessed February 13, 2012). |
| CBE/CSE | PRH [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/PRH. |
| Bluebook | PRH, http://www.acronymgeek.com/PRH (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PRH, http://www.acronymgeek.com/PRH (optional description here) (as of Feb. 13, 2012, 23:28). |
| AMA | PRH. Acronym Geek. February 13, 2012, 23:28. Available at: http://www.acronymgeek.com/PRH. Accessed February 13, 2012, 23:28. |