| APA | ZECA. (2012, February 16). In Acronym Geek. Retrieved 17:00, February 16, 2012, from http://www.acronymgeek.com/ZECA |
| MLA | "ZECA." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/ZECA>. |
| MHRA | 'ZECA', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/ZECA> [accessed 16 February 2012] |
| Chicago | "ZECA", http://www.acronymgeek.com/ZECA (accessed February 16, 2012). |
| CBE/CSE | ZECA [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/ZECA. |
| Bluebook | ZECA, http://www.acronymgeek.com/ZECA (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ZECA, http://www.acronymgeek.com/ZECA (optional description here) (as of Feb. 16, 2012, 17:00). |
| AMA | ZECA. Acronym Geek. February 16, 2012, 17:00. Available at: http://www.acronymgeek.com/ZECA. Accessed February 16, 2012, 17:00. |