| APA | HGSY. (2012, February 17). In Acronym Geek. Retrieved 01:11, February 17, 2012, from http://www.acronymgeek.com/HGSY |
| MLA | "HGSY." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/HGSY>. |
| MHRA | 'HGSY', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/HGSY> [accessed 17 February 2012] |
| Chicago | "HGSY", http://www.acronymgeek.com/HGSY (accessed February 17, 2012). |
| CBE/CSE | HGSY [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/HGSY. |
| Bluebook | HGSY, http://www.acronymgeek.com/HGSY (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HGSY, http://www.acronymgeek.com/HGSY (optional description here) (as of Feb. 17, 2012, 01:11). |
| AMA | HGSY. Acronym Geek. February 17, 2012, 01:11. Available at: http://www.acronymgeek.com/HGSY. Accessed February 17, 2012, 01:11. |