| APA | PORB. (2012, February 11). In Acronym Geek. Retrieved 22:19, February 11, 2012, from http://www.acronymgeek.com/PORB |
| MLA | "PORB." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/PORB>. |
| MHRA | 'PORB', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/PORB> [accessed 11 February 2012] |
| Chicago | "PORB", http://www.acronymgeek.com/PORB (accessed February 11, 2012). |
| CBE/CSE | PORB [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/PORB. |
| Bluebook | PORB, http://www.acronymgeek.com/PORB (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PORB, http://www.acronymgeek.com/PORB (optional description here) (as of Feb. 11, 2012, 22:19). |
| AMA | PORB. Acronym Geek. February 11, 2012, 22:19. Available at: http://www.acronymgeek.com/PORB. Accessed February 11, 2012, 22:19. |