| APA | CEN. (2012, February 9). In Acronym Geek. Retrieved 02:28, February 9, 2012, from http://www.acronymgeek.com/CEN |
| MLA | "CEN." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/CEN>. |
| MHRA | 'CEN', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/CEN> [accessed 9 February 2012] |
| Chicago | "CEN", http://www.acronymgeek.com/CEN (accessed February 9, 2012). |
| CBE/CSE | CEN [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/CEN. |
| Bluebook | CEN, http://www.acronymgeek.com/CEN (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, CEN, http://www.acronymgeek.com/CEN (optional description here) (as of Feb. 9, 2012, 02:28). |
| AMA | CEN. Acronym Geek. February 9, 2012, 02:28. Available at: http://www.acronymgeek.com/CEN. Accessed February 9, 2012, 02:28. |