| APA | HGRK. (2012, February 14). In Acronym Geek. Retrieved 22:19, February 14, 2012, from http://www.acronymgeek.com/HGRK |
| MLA | "HGRK." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HGRK>. |
| MHRA | 'HGRK', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HGRK> [accessed 14 February 2012] |
| Chicago | "HGRK", http://www.acronymgeek.com/HGRK (accessed February 14, 2012). |
| CBE/CSE | HGRK [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HGRK. |
| Bluebook | HGRK, http://www.acronymgeek.com/HGRK (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HGRK, http://www.acronymgeek.com/HGRK (optional description here) (as of Feb. 14, 2012, 22:19). |
| AMA | HGRK. Acronym Geek. February 14, 2012, 22:19. Available at: http://www.acronymgeek.com/HGRK. Accessed February 14, 2012, 22:19. |