| APA | HSYO. (2012, February 15). In Acronym Geek. Retrieved 20:46, February 15, 2012, from http://www.acronymgeek.com/HSYO |
| MLA | "HSYO." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HSYO>. |
| MHRA | 'HSYO', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HSYO> [accessed 15 February 2012] |
| Chicago | "HSYO", http://www.acronymgeek.com/HSYO (accessed February 15, 2012). |
| CBE/CSE | HSYO [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HSYO. |
| Bluebook | HSYO, http://www.acronymgeek.com/HSYO (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HSYO, http://www.acronymgeek.com/HSYO (optional description here) (as of Feb. 15, 2012, 20:46). |
| AMA | HSYO. Acronym Geek. February 15, 2012, 20:46. Available at: http://www.acronymgeek.com/HSYO. Accessed February 15, 2012, 20:46. |