| APA | HAYO. (2012, February 14). In Acronym Geek. Retrieved 08:36, February 14, 2012, from http://www.acronymgeek.com/HAYO |
| MLA | "HAYO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HAYO>. |
| MHRA | 'HAYO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HAYO> [accessed 14 February 2012] |
| Chicago | "HAYO", http://www.acronymgeek.com/HAYO (accessed February 14, 2012). |
| CBE/CSE | HAYO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HAYO. |
| Bluebook | HAYO, http://www.acronymgeek.com/HAYO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HAYO, http://www.acronymgeek.com/HAYO (optional description here) (as of Feb. 14, 2012, 08:36). |
| AMA | HAYO. Acronym Geek. February 14, 2012, 08:36. Available at: http://www.acronymgeek.com/HAYO. Accessed February 14, 2012, 08:36. |