| APA | 4C1N. (2012, February 11). In Acronym Geek. Retrieved 21:14, February 11, 2012, from http://www.acronymgeek.com/4C1N |
| MLA | "4C1N." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/4C1N>. |
| MHRA | '4C1N', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/4C1N> [accessed 11 February 2012] |
| Chicago | "4C1N", http://www.acronymgeek.com/4C1N (accessed February 11, 2012). |
| CBE/CSE | 4C1N [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/4C1N. |
| Bluebook | 4C1N, http://www.acronymgeek.com/4C1N (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, 4C1N, http://www.acronymgeek.com/4C1N (optional description here) (as of Feb. 11, 2012, 21:14). |
| AMA | 4C1N. Acronym Geek. February 11, 2012, 21:14. Available at: http://www.acronymgeek.com/4C1N. Accessed February 11, 2012, 21:14. |