| APA | HZ. (2012, February 9). In Acronym Geek. Retrieved 01:39, February 9, 2012, from http://www.acronymgeek.com/HZ |
| MLA | "HZ." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/HZ>. |
| MHRA | 'HZ', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/HZ> [accessed 9 February 2012] |
| Chicago | "HZ", http://www.acronymgeek.com/HZ (accessed February 9, 2012). |
| CBE/CSE | HZ [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/HZ. |
| Bluebook | HZ, http://www.acronymgeek.com/HZ (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HZ, http://www.acronymgeek.com/HZ (optional description here) (as of Feb. 9, 2012, 01:39). |
| AMA | HZ. Acronym Geek. February 9, 2012, 01:39. Available at: http://www.acronymgeek.com/HZ. Accessed February 9, 2012, 01:39. |