| APA | HYF. (2012, February 14). In Acronym Geek. Retrieved 11:26, February 14, 2012, from http://www.acronymgeek.com/HYF |
| MLA | "HYF." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HYF>. |
| MHRA | 'HYF', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HYF> [accessed 14 February 2012] |
| Chicago | "HYF", http://www.acronymgeek.com/HYF (accessed February 14, 2012). |
| CBE/CSE | HYF [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HYF. |
| Bluebook | HYF, http://www.acronymgeek.com/HYF (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HYF, http://www.acronymgeek.com/HYF (optional description here) (as of Feb. 14, 2012, 11:26). |
| AMA | HYF. Acronym Geek. February 14, 2012, 11:26. Available at: http://www.acronymgeek.com/HYF. Accessed February 14, 2012, 11:26. |