| APA | HHYO. (2012, February 15). In Acronym Geek. Retrieved 13:23, February 15, 2012, from http://www.acronymgeek.com/HHYO |
| MLA | "HHYO." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HHYO>. |
| MHRA | 'HHYO', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HHYO> [accessed 15 February 2012] |
| Chicago | "HHYO", http://www.acronymgeek.com/HHYO (accessed February 15, 2012). |
| CBE/CSE | HHYO [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HHYO. |
| Bluebook | HHYO, http://www.acronymgeek.com/HHYO (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHYO, http://www.acronymgeek.com/HHYO (optional description here) (as of Feb. 15, 2012, 13:23). |
| AMA | HHYO. Acronym Geek. February 15, 2012, 13:23. Available at: http://www.acronymgeek.com/HHYO. Accessed February 15, 2012, 13:23. |