| APA | PORR. (2012, February 12). In Acronym Geek. Retrieved 01:05, February 12, 2012, from http://www.acronymgeek.com/PORR |
| MLA | "PORR." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/PORR>. |
| MHRA | 'PORR', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/PORR> [accessed 12 February 2012] |
| Chicago | "PORR", http://www.acronymgeek.com/PORR (accessed February 12, 2012). |
| CBE/CSE | PORR [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/PORR. |
| Bluebook | PORR, http://www.acronymgeek.com/PORR (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PORR, http://www.acronymgeek.com/PORR (optional description here) (as of Feb. 12, 2012, 01:05). |
| AMA | PORR. Acronym Geek. February 12, 2012, 01:05. Available at: http://www.acronymgeek.com/PORR. Accessed February 12, 2012, 01:05. |