| APA | HHZ. (2012, February 14). In Acronym Geek. Retrieved 11:22, February 14, 2012, from http://www.acronymgeek.com/HHZ |
| MLA | "HHZ." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HHZ>. |
| MHRA | 'HHZ', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HHZ> [accessed 14 February 2012] |
| Chicago | "HHZ", http://www.acronymgeek.com/HHZ (accessed February 14, 2012). |
| CBE/CSE | HHZ [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HHZ. |
| Bluebook | HHZ, http://www.acronymgeek.com/HHZ (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHZ, http://www.acronymgeek.com/HHZ (optional description here) (as of Feb. 14, 2012, 11:22). |
| AMA | HHZ. Acronym Geek. February 14, 2012, 11:22. Available at: http://www.acronymgeek.com/HHZ. Accessed February 14, 2012, 11:22. |