| APA | ZRO. (2012, February 14). In Acronym Geek. Retrieved 02:23, February 14, 2012, from http://www.acronymgeek.com/ZRO |
| MLA | "ZRO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/ZRO>. |
| MHRA | 'ZRO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/ZRO> [accessed 14 February 2012] |
| Chicago | "ZRO", http://www.acronymgeek.com/ZRO (accessed February 14, 2012). |
| CBE/CSE | ZRO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/ZRO. |
| Bluebook | ZRO, http://www.acronymgeek.com/ZRO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ZRO, http://www.acronymgeek.com/ZRO (optional description here) (as of Feb. 14, 2012, 02:23). |
| AMA | ZRO. Acronym Geek. February 14, 2012, 02:23. Available at: http://www.acronymgeek.com/ZRO. Accessed February 14, 2012, 02:23. |