| APA | PK. (2012, February 14). In Acronym Geek. Retrieved 06:56, February 14, 2012, from http://www.acronymgeek.com/PK |
| MLA | "PK." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PK>. |
| MHRA | 'PK', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PK> [accessed 14 February 2012] |
| Chicago | "PK", http://www.acronymgeek.com/PK (accessed February 14, 2012). |
| CBE/CSE | PK [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PK. |
| Bluebook | PK, http://www.acronymgeek.com/PK (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PK, http://www.acronymgeek.com/PK (optional description here) (as of Feb. 14, 2012, 06:56). |
| AMA | PK. Acronym Geek. February 14, 2012, 06:56. Available at: http://www.acronymgeek.com/PK. Accessed February 14, 2012, 06:56. |