| APA | PII. (2012, February 13). In Acronym Geek. Retrieved 21:04, February 13, 2012, from http://www.acronymgeek.com/PII |
| MLA | "PII." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/PII>. |
| MHRA | 'PII', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/PII> [accessed 13 February 2012] |
| Chicago | "PII", http://www.acronymgeek.com/PII (accessed February 13, 2012). |
| CBE/CSE | PII [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/PII. |
| Bluebook | PII, http://www.acronymgeek.com/PII (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PII, http://www.acronymgeek.com/PII (optional description here) (as of Feb. 13, 2012, 21:04). |
| AMA | PII. Acronym Geek. February 13, 2012, 21:04. Available at: http://www.acronymgeek.com/PII. Accessed February 13, 2012, 21:04. |