| APA | ZELS. (2012, February 17). In Acronym Geek. Retrieved 00:45, February 17, 2012, from http://www.acronymgeek.com/ZELS |
| MLA | "ZELS." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/ZELS>. |
| MHRA | 'ZELS', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/ZELS> [accessed 17 February 2012] |
| Chicago | "ZELS", http://www.acronymgeek.com/ZELS (accessed February 17, 2012). |
| CBE/CSE | ZELS [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/ZELS. |
| Bluebook | ZELS, http://www.acronymgeek.com/ZELS (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ZELS, http://www.acronymgeek.com/ZELS (optional description here) (as of Feb. 17, 2012, 00:45). |
| AMA | ZELS. Acronym Geek. February 17, 2012, 00:45. Available at: http://www.acronymgeek.com/ZELS. Accessed February 17, 2012, 00:45. |