| APA | ZRGK. (2012, February 15). In Acronym Geek. Retrieved 06:07, February 15, 2012, from http://www.acronymgeek.com/ZRGK |
| MLA | "ZRGK." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/ZRGK>. |
| MHRA | 'ZRGK', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/ZRGK> [accessed 15 February 2012] |
| Chicago | "ZRGK", http://www.acronymgeek.com/ZRGK (accessed February 15, 2012). |
| CBE/CSE | ZRGK [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/ZRGK. |
| Bluebook | ZRGK, http://www.acronymgeek.com/ZRGK (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ZRGK, http://www.acronymgeek.com/ZRGK (optional description here) (as of Feb. 15, 2012, 06:07). |
| AMA | ZRGK. Acronym Geek. February 15, 2012, 06:07. Available at: http://www.acronymgeek.com/ZRGK. Accessed February 15, 2012, 06:07. |