| APA | HLPD. (2012, February 15). In Acronym Geek. Retrieved 12:42, February 15, 2012, from http://www.acronymgeek.com/HLPD |
| MLA | "HLPD." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HLPD>. |
| MHRA | 'HLPD', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HLPD> [accessed 15 February 2012] |
| Chicago | "HLPD", http://www.acronymgeek.com/HLPD (accessed February 15, 2012). |
| CBE/CSE | HLPD [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HLPD. |
| Bluebook | HLPD, http://www.acronymgeek.com/HLPD (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HLPD, http://www.acronymgeek.com/HLPD (optional description here) (as of Feb. 15, 2012, 12:42). |
| AMA | HLPD. Acronym Geek. February 15, 2012, 12:42. Available at: http://www.acronymgeek.com/HLPD. Accessed February 15, 2012, 12:42. |