| APA | HHGN. (2012, February 17). In Acronym Geek. Retrieved 06:25, February 17, 2012, from http://www.acronymgeek.com/HHGN |
| MLA | "HHGN." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/HHGN>. |
| MHRA | 'HHGN', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/HHGN> [accessed 17 February 2012] |
| Chicago | "HHGN", http://www.acronymgeek.com/HHGN (accessed February 17, 2012). |
| CBE/CSE | HHGN [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/HHGN. |
| Bluebook | HHGN, http://www.acronymgeek.com/HHGN (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHGN, http://www.acronymgeek.com/HHGN (optional description here) (as of Feb. 17, 2012, 06:25). |
| AMA | HHGN. Acronym Geek. February 17, 2012, 06:25. Available at: http://www.acronymgeek.com/HHGN. Accessed February 17, 2012, 06:25. |