| APA | HHYD. (2012, February 16). In Acronym Geek. Retrieved 18:12, February 16, 2012, from http://www.acronymgeek.com/HHYD |
| MLA | "HHYD." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HHYD>. |
| MHRA | 'HHYD', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HHYD> [accessed 16 February 2012] |
| Chicago | "HHYD", http://www.acronymgeek.com/HHYD (accessed February 16, 2012). |
| CBE/CSE | HHYD [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HHYD. |
| Bluebook | HHYD, http://www.acronymgeek.com/HHYD (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HHYD, http://www.acronymgeek.com/HHYD (optional description here) (as of Feb. 16, 2012, 18:12). |
| AMA | HHYD. Acronym Geek. February 16, 2012, 18:12. Available at: http://www.acronymgeek.com/HHYD. Accessed February 16, 2012, 18:12. |