| APA | HAYF. (2012, February 15). In Acronym Geek. Retrieved 19:12, February 15, 2012, from http://www.acronymgeek.com/HAYF |
| MLA | "HAYF." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HAYF>. |
| MHRA | 'HAYF', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HAYF> [accessed 15 February 2012] |
| Chicago | "HAYF", http://www.acronymgeek.com/HAYF (accessed February 15, 2012). |
| CBE/CSE | HAYF [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HAYF. |
| Bluebook | HAYF, http://www.acronymgeek.com/HAYF (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HAYF, http://www.acronymgeek.com/HAYF (optional description here) (as of Feb. 15, 2012, 19:12). |
| AMA | HAYF. Acronym Geek. February 15, 2012, 19:12. Available at: http://www.acronymgeek.com/HAYF. Accessed February 15, 2012, 19:12. |