| APA | HHEC. (2012, February 12). In Acronym Geek. Retrieved 12:39, February 12, 2012, from http://www.acronymgeek.com/HHEC |
| MLA | "HHEC." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/HHEC>. |
| MHRA | 'HHEC', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/HHEC> [accessed 12 February 2012] |
| Chicago | "HHEC", http://www.acronymgeek.com/HHEC (accessed February 12, 2012). |
| CBE/CSE | HHEC [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/HHEC. |
| Bluebook | HHEC, http://www.acronymgeek.com/HHEC (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHEC, http://www.acronymgeek.com/HHEC (optional description here) (as of Feb. 12, 2012, 12:39). |
| AMA | HHEC. Acronym Geek. February 12, 2012, 12:39. Available at: http://www.acronymgeek.com/HHEC. Accessed February 12, 2012, 12:39. |