| APA | HFDU. (2012, February 15). In Acronym Geek. Retrieved 14:16, February 15, 2012, from http://www.acronymgeek.com/HFDU |
| MLA | "HFDU." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HFDU>. |
| MHRA | 'HFDU', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HFDU> [accessed 15 February 2012] |
| Chicago | "HFDU", http://www.acronymgeek.com/HFDU (accessed February 15, 2012). |
| CBE/CSE | HFDU [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HFDU. |
| Bluebook | HFDU, http://www.acronymgeek.com/HFDU (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HFDU, http://www.acronymgeek.com/HFDU (optional description here) (as of Feb. 15, 2012, 14:16). |
| AMA | HFDU. Acronym Geek. February 15, 2012, 14:16. Available at: http://www.acronymgeek.com/HFDU. Accessed February 15, 2012, 14:16. |