| APA | CHK. (2012, February 10). In Acronym Geek. Retrieved 16:53, February 10, 2012, from http://www.acronymgeek.com/CHK |
| MLA | "CHK." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/CHK>. |
| MHRA | 'CHK', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/CHK> [accessed 10 February 2012] |
| Chicago | "CHK", http://www.acronymgeek.com/CHK (accessed February 10, 2012). |
| CBE/CSE | CHK [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/CHK. |
| Bluebook | CHK, http://www.acronymgeek.com/CHK (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, CHK, http://www.acronymgeek.com/CHK (optional description here) (as of Feb. 10, 2012, 16:53). |
| AMA | CHK. Acronym Geek. February 10, 2012, 16:53. Available at: http://www.acronymgeek.com/CHK. Accessed February 10, 2012, 16:53. |