| APA | HZOL. (2012, February 14). In Acronym Geek. Retrieved 15:15, February 14, 2012, from http://www.acronymgeek.com/HZOL |
| MLA | "HZOL." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HZOL>. |
| MHRA | 'HZOL', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HZOL> [accessed 14 February 2012] |
| Chicago | "HZOL", http://www.acronymgeek.com/HZOL (accessed February 14, 2012). |
| CBE/CSE | HZOL [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HZOL. |
| Bluebook | HZOL, http://www.acronymgeek.com/HZOL (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HZOL, http://www.acronymgeek.com/HZOL (optional description here) (as of Feb. 14, 2012, 15:15). |
| AMA | HZOL. Acronym Geek. February 14, 2012, 15:15. Available at: http://www.acronymgeek.com/HZOL. Accessed February 14, 2012, 15:15. |