| APA | HEIU. (2012, February 17). In Acronym Geek. Retrieved 01:18, February 17, 2012, from http://www.acronymgeek.com/HEIU |
| MLA | "HEIU." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/HEIU>. |
| MHRA | 'HEIU', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/HEIU> [accessed 17 February 2012] |
| Chicago | "HEIU", http://www.acronymgeek.com/HEIU (accessed February 17, 2012). |
| CBE/CSE | HEIU [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/HEIU. |
| Bluebook | HEIU, http://www.acronymgeek.com/HEIU (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HEIU, http://www.acronymgeek.com/HEIU (optional description here) (as of Feb. 17, 2012, 01:18). |
| AMA | HEIU. Acronym Geek. February 17, 2012, 01:18. Available at: http://www.acronymgeek.com/HEIU. Accessed February 17, 2012, 01:18. |