| APA | HEEC. (2012, February 15). In Acronym Geek. Retrieved 14:22, February 15, 2012, from http://www.acronymgeek.com/HEEC |
| MLA | "HEEC." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HEEC>. |
| MHRA | 'HEEC', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HEEC> [accessed 15 February 2012] |
| Chicago | "HEEC", http://www.acronymgeek.com/HEEC (accessed February 15, 2012). |
| CBE/CSE | HEEC [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HEEC. |
| Bluebook | HEEC, http://www.acronymgeek.com/HEEC (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HEEC, http://www.acronymgeek.com/HEEC (optional description here) (as of Feb. 15, 2012, 14:22). |
| AMA | HEEC. Acronym Geek. February 15, 2012, 14:22. Available at: http://www.acronymgeek.com/HEEC. Accessed February 15, 2012, 14:22. |