| APA | PDHN. (2012, February 15). In Acronym Geek. Retrieved 20:57, February 15, 2012, from http://www.acronymgeek.com/PDHN |
| MLA | "PDHN." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/PDHN>. |
| MHRA | 'PDHN', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/PDHN> [accessed 15 February 2012] |
| Chicago | "PDHN", http://www.acronymgeek.com/PDHN (accessed February 15, 2012). |
| CBE/CSE | PDHN [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/PDHN. |
| Bluebook | PDHN, http://www.acronymgeek.com/PDHN (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PDHN, http://www.acronymgeek.com/PDHN (optional description here) (as of Feb. 15, 2012, 20:57). |
| AMA | PDHN. Acronym Geek. February 15, 2012, 20:57. Available at: http://www.acronymgeek.com/PDHN. Accessed February 15, 2012, 20:57. |