| APA | PTDC. (2012, February 16). In Acronym Geek. Retrieved 22:20, February 16, 2012, from http://www.acronymgeek.com/PTDC |
| MLA | "PTDC." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/PTDC>. |
| MHRA | 'PTDC', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/PTDC> [accessed 16 February 2012] |
| Chicago | "PTDC", http://www.acronymgeek.com/PTDC (accessed February 16, 2012). |
| CBE/CSE | PTDC [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/PTDC. |
| Bluebook | PTDC, http://www.acronymgeek.com/PTDC (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTDC, http://www.acronymgeek.com/PTDC (optional description here) (as of Feb. 16, 2012, 22:20). |
| AMA | PTDC. Acronym Geek. February 16, 2012, 22:20. Available at: http://www.acronymgeek.com/PTDC. Accessed February 16, 2012, 22:20. |