| APA | PDL. (2012, February 14). In Acronym Geek. Retrieved 06:38, February 14, 2012, from http://www.acronymgeek.com/PDL |
| MLA | "PDL." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PDL>. |
| MHRA | 'PDL', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PDL> [accessed 14 February 2012] |
| Chicago | "PDL", http://www.acronymgeek.com/PDL (accessed February 14, 2012). |
| CBE/CSE | PDL [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PDL. |
| Bluebook | PDL, http://www.acronymgeek.com/PDL (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PDL, http://www.acronymgeek.com/PDL (optional description here) (as of Feb. 14, 2012, 06:38). |
| AMA | PDL. Acronym Geek. February 14, 2012, 06:38. Available at: http://www.acronymgeek.com/PDL. Accessed February 14, 2012, 06:38. |