| APA | HHDF. (2012, February 15). In Acronym Geek. Retrieved 19:04, February 15, 2012, from http://www.acronymgeek.com/HHDF |
| MLA | "HHDF." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HHDF>. |
| MHRA | 'HHDF', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HHDF> [accessed 15 February 2012] |
| Chicago | "HHDF", http://www.acronymgeek.com/HHDF (accessed February 15, 2012). |
| CBE/CSE | HHDF [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HHDF. |
| Bluebook | HHDF, http://www.acronymgeek.com/HHDF (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHDF, http://www.acronymgeek.com/HHDF (optional description here) (as of Feb. 15, 2012, 19:04). |
| AMA | HHDF. Acronym Geek. February 15, 2012, 19:04. Available at: http://www.acronymgeek.com/HHDF. Accessed February 15, 2012, 19:04. |