| APA | ZEM. (2012, February 14). In Acronym Geek. Retrieved 07:03, February 14, 2012, from http://www.acronymgeek.com/ZEM |
| MLA | "ZEM." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/ZEM>. |
| MHRA | 'ZEM', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/ZEM> [accessed 14 February 2012] |
| Chicago | "ZEM", http://www.acronymgeek.com/ZEM (accessed February 14, 2012). |
| CBE/CSE | ZEM [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/ZEM. |
| Bluebook | ZEM, http://www.acronymgeek.com/ZEM (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ZEM, http://www.acronymgeek.com/ZEM (optional description here) (as of Feb. 14, 2012, 07:03). |
| AMA | ZEM. Acronym Geek. February 14, 2012, 07:03. Available at: http://www.acronymgeek.com/ZEM. Accessed February 14, 2012, 07:03. |