| APA | PEK. (2012, February 13). In Acronym Geek. Retrieved 22:38, February 13, 2012, from http://www.acronymgeek.com/PEK |
| MLA | "PEK." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/PEK>. |
| MHRA | 'PEK', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/PEK> [accessed 13 February 2012] |
| Chicago | "PEK", http://www.acronymgeek.com/PEK (accessed February 13, 2012). |
| CBE/CSE | PEK [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/PEK. |
| Bluebook | PEK, http://www.acronymgeek.com/PEK (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PEK, http://www.acronymgeek.com/PEK (optional description here) (as of Feb. 13, 2012, 22:38). |
| AMA | PEK. Acronym Geek. February 13, 2012, 22:38. Available at: http://www.acronymgeek.com/PEK. Accessed February 13, 2012, 22:38. |