| APA | HRN. (2012, February 14). In Acronym Geek. Retrieved 02:09, February 14, 2012, from http://www.acronymgeek.com/HRN |
| MLA | "HRN." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HRN>. |
| MHRA | 'HRN', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HRN> [accessed 14 February 2012] |
| Chicago | "HRN", http://www.acronymgeek.com/HRN (accessed February 14, 2012). |
| CBE/CSE | HRN [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HRN. |
| Bluebook | HRN, http://www.acronymgeek.com/HRN (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HRN, http://www.acronymgeek.com/HRN (optional description here) (as of Feb. 14, 2012, 02:09). |
| AMA | HRN. Acronym Geek. February 14, 2012, 02:09. Available at: http://www.acronymgeek.com/HRN. Accessed February 14, 2012, 02:09. |