| APA | HAPP. (2012, February 16). In Acronym Geek. Retrieved 03:22, February 16, 2012, from http://www.acronymgeek.com/HAPP |
| MLA | "HAPP." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HAPP>. |
| MHRA | 'HAPP', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HAPP> [accessed 16 February 2012] |
| Chicago | "HAPP", http://www.acronymgeek.com/HAPP (accessed February 16, 2012). |
| CBE/CSE | HAPP [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HAPP. |
| Bluebook | HAPP, http://www.acronymgeek.com/HAPP (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HAPP, http://www.acronymgeek.com/HAPP (optional description here) (as of Feb. 16, 2012, 03:22). |
| AMA | HAPP. Acronym Geek. February 16, 2012, 03:22. Available at: http://www.acronymgeek.com/HAPP. Accessed February 16, 2012, 03:22. |