| APA | CRKF. (2012, February 17). In Acronym Geek. Retrieved 03:41, February 17, 2012, from http://www.acronymgeek.com/CRKF |
| MLA | "CRKF." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/CRKF>. |
| MHRA | 'CRKF', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/CRKF> [accessed 17 February 2012] |
| Chicago | "CRKF", http://www.acronymgeek.com/CRKF (accessed February 17, 2012). |
| CBE/CSE | CRKF [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/CRKF. |
| Bluebook | CRKF, http://www.acronymgeek.com/CRKF (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, CRKF, http://www.acronymgeek.com/CRKF (optional description here) (as of Feb. 17, 2012, 03:41). |
| AMA | CRKF. Acronym Geek. February 17, 2012, 03:41. Available at: http://www.acronymgeek.com/CRKF. Accessed February 17, 2012, 03:41. |