| APA | PKI. (2012, February 10). In Acronym Geek. Retrieved 11:15, February 10, 2012, from http://www.acronymgeek.com/PKI |
| MLA | "PKI." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/PKI>. |
| MHRA | 'PKI', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/PKI> [accessed 10 February 2012] |
| Chicago | "PKI", http://www.acronymgeek.com/PKI (accessed February 10, 2012). |
| CBE/CSE | PKI [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/PKI. |
| Bluebook | PKI, http://www.acronymgeek.com/PKI (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PKI, http://www.acronymgeek.com/PKI (optional description here) (as of Feb. 10, 2012, 11:15). |
| AMA | PKI. Acronym Geek. February 10, 2012, 11:15. Available at: http://www.acronymgeek.com/PKI. Accessed February 10, 2012, 11:15. |