| APA | HREI. (2012, February 16). In Acronym Geek. Retrieved 20:20, February 16, 2012, from http://www.acronymgeek.com/HREI |
| MLA | "HREI." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HREI>. |
| MHRA | 'HREI', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HREI> [accessed 16 February 2012] |
| Chicago | "HREI", http://www.acronymgeek.com/HREI (accessed February 16, 2012). |
| CBE/CSE | HREI [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HREI. |
| Bluebook | HREI, http://www.acronymgeek.com/HREI (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HREI, http://www.acronymgeek.com/HREI (optional description here) (as of Feb. 16, 2012, 20:20). |
| AMA | HREI. Acronym Geek. February 16, 2012, 20:20. Available at: http://www.acronymgeek.com/HREI. Accessed February 16, 2012, 20:20. |