| APA | HAGN. (2012, February 12). In Acronym Geek. Retrieved 12:58, February 12, 2012, from http://www.acronymgeek.com/HAGN |
| MLA | "HAGN." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/HAGN>. |
| MHRA | 'HAGN', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/HAGN> [accessed 12 February 2012] |
| Chicago | "HAGN", http://www.acronymgeek.com/HAGN (accessed February 12, 2012). |
| CBE/CSE | HAGN [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/HAGN. |
| Bluebook | HAGN, http://www.acronymgeek.com/HAGN (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HAGN, http://www.acronymgeek.com/HAGN (optional description here) (as of Feb. 12, 2012, 12:58). |
| AMA | HAGN. Acronym Geek. February 12, 2012, 12:58. Available at: http://www.acronymgeek.com/HAGN. Accessed February 12, 2012, 12:58. |