| APA | HEP. (2012, February 14). In Acronym Geek. Retrieved 08:04, February 14, 2012, from http://www.acronymgeek.com/HEP |
| MLA | "HEP." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HEP>. |
| MHRA | 'HEP', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HEP> [accessed 14 February 2012] |
| Chicago | "HEP", http://www.acronymgeek.com/HEP (accessed February 14, 2012). |
| CBE/CSE | HEP [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HEP. |
| Bluebook | HEP, http://www.acronymgeek.com/HEP (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HEP, http://www.acronymgeek.com/HEP (optional description here) (as of Feb. 14, 2012, 08:04). |
| AMA | HEP. Acronym Geek. February 14, 2012, 08:04. Available at: http://www.acronymgeek.com/HEP. Accessed February 14, 2012, 08:04. |