| APA | P&I. (2012, February 9). In Acronym Geek. Retrieved 14:40, February 9, 2012, from http://www.acronymgeek.com/P&I |
| MLA | "P&I." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/P&I>. |
| MHRA | 'P&I', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/P&I> [accessed 9 February 2012] |
| Chicago | "P&I", http://www.acronymgeek.com/P&I (accessed February 9, 2012). |
| CBE/CSE | P&I [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/P&I. |
| Bluebook | P&I, http://www.acronymgeek.com/P&I (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, P&I, http://www.acronymgeek.com/P&I (optional description here) (as of Feb. 9, 2012, 14:40). |
| AMA | P&I. Acronym Geek. February 9, 2012, 14:40. Available at: http://www.acronymgeek.com/P&I. Accessed February 9, 2012, 14:40. |