| APA | HPY. (2012, February 15). In Acronym Geek. Retrieved 03:41, February 15, 2012, from http://www.acronymgeek.com/HPY |
| MLA | "HPY." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HPY>. |
| MHRA | 'HPY', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HPY> [accessed 15 February 2012] |
| Chicago | "HPY", http://www.acronymgeek.com/HPY (accessed February 15, 2012). |
| CBE/CSE | HPY [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HPY. |
| Bluebook | HPY, http://www.acronymgeek.com/HPY (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HPY, http://www.acronymgeek.com/HPY (optional description here) (as of Feb. 15, 2012, 03:41). |
| AMA | HPY. Acronym Geek. February 15, 2012, 03:41. Available at: http://www.acronymgeek.com/HPY. Accessed February 15, 2012, 03:41. |