| APA | HAP. (2012, February 9). In Acronym Geek. Retrieved 20:45, February 9, 2012, from http://www.acronymgeek.com/HAP |
| MLA | "HAP." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/HAP>. |
| MHRA | 'HAP', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/HAP> [accessed 9 February 2012] |
| Chicago | "HAP", http://www.acronymgeek.com/HAP (accessed February 9, 2012). |
| CBE/CSE | HAP [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/HAP. |
| Bluebook | HAP, http://www.acronymgeek.com/HAP (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HAP, http://www.acronymgeek.com/HAP (optional description here) (as of Feb. 9, 2012, 20:45). |
| AMA | HAP. Acronym Geek. February 9, 2012, 20:45. Available at: http://www.acronymgeek.com/HAP. Accessed February 9, 2012, 20:45. |