| APA | HHGL. (2012, February 14). In Acronym Geek. Retrieved 21:14, February 14, 2012, from http://www.acronymgeek.com/HHGL |
| MLA | "HHGL." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HHGL>. |
| MHRA | 'HHGL', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HHGL> [accessed 14 February 2012] |
| Chicago | "HHGL", http://www.acronymgeek.com/HHGL (accessed February 14, 2012). |
| CBE/CSE | HHGL [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HHGL. |
| Bluebook | HHGL, http://www.acronymgeek.com/HHGL (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHGL, http://www.acronymgeek.com/HHGL (optional description here) (as of Feb. 14, 2012, 21:14). |
| AMA | HHGL. Acronym Geek. February 14, 2012, 21:14. Available at: http://www.acronymgeek.com/HHGL. Accessed February 14, 2012, 21:14. |