| APA | ZRK. (2012, February 14). In Acronym Geek. Retrieved 19:11, February 14, 2012, from http://www.acronymgeek.com/ZRK |
| MLA | "ZRK." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/ZRK>. |
| MHRA | 'ZRK', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/ZRK> [accessed 14 February 2012] |
| Chicago | "ZRK", http://www.acronymgeek.com/ZRK (accessed February 14, 2012). |
| CBE/CSE | ZRK [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/ZRK. |
| Bluebook | ZRK, http://www.acronymgeek.com/ZRK (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ZRK, http://www.acronymgeek.com/ZRK (optional description here) (as of Feb. 14, 2012, 19:11). |
| AMA | ZRK. Acronym Geek. February 14, 2012, 19:11. Available at: http://www.acronymgeek.com/ZRK. Accessed February 14, 2012, 19:11. |