| APA | HHEX. (2012, February 11). In Acronym Geek. Retrieved 20:25, February 11, 2012, from http://www.acronymgeek.com/HHEX |
| MLA | "HHEX." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/HHEX>. |
| MHRA | 'HHEX', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/HHEX> [accessed 11 February 2012] |
| Chicago | "HHEX", http://www.acronymgeek.com/HHEX (accessed February 11, 2012). |
| CBE/CSE | HHEX [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/HHEX. |
| Bluebook | HHEX, http://www.acronymgeek.com/HHEX (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHEX, http://www.acronymgeek.com/HHEX (optional description here) (as of Feb. 11, 2012, 20:25). |
| AMA | HHEX. Acronym Geek. February 11, 2012, 20:25. Available at: http://www.acronymgeek.com/HHEX. Accessed February 11, 2012, 20:25. |