| APA | 4K. (2012, February 10). In Acronym Geek. Retrieved 09:40, February 10, 2012, from http://www.acronymgeek.com/4K |
| MLA | "4K." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/4K>. |
| MHRA | '4K', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/4K> [accessed 10 February 2012] |
| Chicago | "4K", http://www.acronymgeek.com/4K (accessed February 10, 2012). |
| CBE/CSE | 4K [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/4K. |
| Bluebook | 4K, http://www.acronymgeek.com/4K (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, 4K, http://www.acronymgeek.com/4K (optional description here) (as of Feb. 10, 2012, 09:40). |
| AMA | 4K. Acronym Geek. February 10, 2012, 09:40. Available at: http://www.acronymgeek.com/4K. Accessed February 10, 2012, 09:40. |