| APA | KPN. (2012, February 14). In Acronym Geek. Retrieved 20:30, February 14, 2012, from http://www.acronymgeek.com/KPN |
| MLA | "KPN." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/KPN>. |
| MHRA | 'KPN', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/KPN> [accessed 14 February 2012] |
| Chicago | "KPN", http://www.acronymgeek.com/KPN (accessed February 14, 2012). |
| CBE/CSE | KPN [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/KPN. |
| Bluebook | KPN, http://www.acronymgeek.com/KPN (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, KPN, http://www.acronymgeek.com/KPN (optional description here) (as of Feb. 14, 2012, 20:30). |
| AMA | KPN. Acronym Geek. February 14, 2012, 20:30. Available at: http://www.acronymgeek.com/KPN. Accessed February 14, 2012, 20:30. |