| APA | PDH. (2012, February 13). In Acronym Geek. Retrieved 21:26, February 13, 2012, from http://www.acronymgeek.com/PDH |
| MLA | "PDH." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/PDH>. |
| MHRA | 'PDH', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/PDH> [accessed 13 February 2012] |
| Chicago | "PDH", http://www.acronymgeek.com/PDH (accessed February 13, 2012). |
| CBE/CSE | PDH [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/PDH. |
| Bluebook | PDH, http://www.acronymgeek.com/PDH (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PDH, http://www.acronymgeek.com/PDH (optional description here) (as of Feb. 13, 2012, 21:26). |
| AMA | PDH. Acronym Geek. February 13, 2012, 21:26. Available at: http://www.acronymgeek.com/PDH. Accessed February 13, 2012, 21:26. |