| APA | PIR. (2012, February 15). In Acronym Geek. Retrieved 03:35, February 15, 2012, from http://www.acronymgeek.com/PIR |
| MLA | "PIR." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/PIR>. |
| MHRA | 'PIR', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/PIR> [accessed 15 February 2012] |
| Chicago | "PIR", http://www.acronymgeek.com/PIR (accessed February 15, 2012). |
| CBE/CSE | PIR [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/PIR. |
| Bluebook | PIR, http://www.acronymgeek.com/PIR (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PIR, http://www.acronymgeek.com/PIR (optional description here) (as of Feb. 15, 2012, 03:35). |
| AMA | PIR. Acronym Geek. February 15, 2012, 03:35. Available at: http://www.acronymgeek.com/PIR. Accessed February 15, 2012, 03:35. |