| APA | HCG. (2012, February 10). In Acronym Geek. Retrieved 18:02, February 10, 2012, from http://www.acronymgeek.com/HCG |
| MLA | "HCG." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/HCG>. |
| MHRA | 'HCG', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/HCG> [accessed 10 February 2012] |
| Chicago | "HCG", http://www.acronymgeek.com/HCG (accessed February 10, 2012). |
| CBE/CSE | HCG [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/HCG. |
| Bluebook | HCG, http://www.acronymgeek.com/HCG (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HCG, http://www.acronymgeek.com/HCG (optional description here) (as of Feb. 10, 2012, 18:02). |
| AMA | HCG. Acronym Geek. February 10, 2012, 18:02. Available at: http://www.acronymgeek.com/HCG. Accessed February 10, 2012, 18:02. |