| APA | HHE. (2012, February 15). In Acronym Geek. Retrieved 03:41, February 15, 2012, from http://www.acronymgeek.com/HHE |
| MLA | "HHE." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HHE>. |
| MHRA | 'HHE', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HHE> [accessed 15 February 2012] |
| Chicago | "HHE", http://www.acronymgeek.com/HHE (accessed February 15, 2012). |
| CBE/CSE | HHE [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HHE. |
| Bluebook | HHE, http://www.acronymgeek.com/HHE (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHE, http://www.acronymgeek.com/HHE (optional description here) (as of Feb. 15, 2012, 03:41). |
| AMA | HHE. Acronym Geek. February 15, 2012, 03:41. Available at: http://www.acronymgeek.com/HHE. Accessed February 15, 2012, 03:41. |