| APA | HHEV. (2012, February 15). In Acronym Geek. Retrieved 14:30, February 15, 2012, from http://www.acronymgeek.com/HHEV |
| MLA | "HHEV." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HHEV>. |
| MHRA | 'HHEV', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HHEV> [accessed 15 February 2012] |
| Chicago | "HHEV", http://www.acronymgeek.com/HHEV (accessed February 15, 2012). |
| CBE/CSE | HHEV [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HHEV. |
| Bluebook | HHEV, http://www.acronymgeek.com/HHEV (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHEV, http://www.acronymgeek.com/HHEV (optional description here) (as of Feb. 15, 2012, 14:30). |
| AMA | HHEV. Acronym Geek. February 15, 2012, 14:30. Available at: http://www.acronymgeek.com/HHEV. Accessed February 15, 2012, 14:30. |