| APA | ZTR. (2012, February 14). In Acronym Geek. Retrieved 04:30, February 14, 2012, from http://www.acronymgeek.com/ZTR |
| MLA | "ZTR." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/ZTR>. |
| MHRA | 'ZTR', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/ZTR> [accessed 14 February 2012] |
| Chicago | "ZTR", http://www.acronymgeek.com/ZTR (accessed February 14, 2012). |
| CBE/CSE | ZTR [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/ZTR. |
| Bluebook | ZTR, http://www.acronymgeek.com/ZTR (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ZTR, http://www.acronymgeek.com/ZTR (optional description here) (as of Feb. 14, 2012, 04:30). |
| AMA | ZTR. Acronym Geek. February 14, 2012, 04:30. Available at: http://www.acronymgeek.com/ZTR. Accessed February 14, 2012, 04:30. |