| APA | HREK. (2012, February 16). In Acronym Geek. Retrieved 02:43, February 16, 2012, from http://www.acronymgeek.com/HREK |
| MLA | "HREK." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HREK>. |
| MHRA | 'HREK', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HREK> [accessed 16 February 2012] |
| Chicago | "HREK", http://www.acronymgeek.com/HREK (accessed February 16, 2012). |
| CBE/CSE | HREK [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HREK. |
| Bluebook | HREK, http://www.acronymgeek.com/HREK (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HREK, http://www.acronymgeek.com/HREK (optional description here) (as of Feb. 16, 2012, 02:43). |
| AMA | HREK. Acronym Geek. February 16, 2012, 02:43. Available at: http://www.acronymgeek.com/HREK. Accessed February 16, 2012, 02:43. |