| APA | HHM. (2012, February 13). In Acronym Geek. Retrieved 23:56, February 13, 2012, from http://www.acronymgeek.com/HHM |
| MLA | "HHM." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/HHM>. |
| MHRA | 'HHM', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/HHM> [accessed 13 February 2012] |
| Chicago | "HHM", http://www.acronymgeek.com/HHM (accessed February 13, 2012). |
| CBE/CSE | HHM [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/HHM. |
| Bluebook | HHM, http://www.acronymgeek.com/HHM (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHM, http://www.acronymgeek.com/HHM (optional description here) (as of Feb. 13, 2012, 23:56). |
| AMA | HHM. Acronym Geek. February 13, 2012, 23:56. Available at: http://www.acronymgeek.com/HHM. Accessed February 13, 2012, 23:56. |