| APA | ZR. (2012, February 11). In Acronym Geek. Retrieved 21:55, February 11, 2012, from http://www.acronymgeek.com/ZR |
| MLA | "ZR." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/ZR>. |
| MHRA | 'ZR', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/ZR> [accessed 11 February 2012] |
| Chicago | "ZR", http://www.acronymgeek.com/ZR (accessed February 11, 2012). |
| CBE/CSE | ZR [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/ZR. |
| Bluebook | ZR, http://www.acronymgeek.com/ZR (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ZR, http://www.acronymgeek.com/ZR (optional description here) (as of Feb. 11, 2012, 21:55). |
| AMA | ZR. Acronym Geek. February 11, 2012, 21:55. Available at: http://www.acronymgeek.com/ZR. Accessed February 11, 2012, 21:55. |