| APA | PTDA. (2012, February 16). In Acronym Geek. Retrieved 16:30, February 16, 2012, from http://www.acronymgeek.com/PTDA |
| MLA | "PTDA." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/PTDA>. |
| MHRA | 'PTDA', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/PTDA> [accessed 16 February 2012] |
| Chicago | "PTDA", http://www.acronymgeek.com/PTDA (accessed February 16, 2012). |
| CBE/CSE | PTDA [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/PTDA. |
| Bluebook | PTDA, http://www.acronymgeek.com/PTDA (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTDA, http://www.acronymgeek.com/PTDA (optional description here) (as of Feb. 16, 2012, 16:30). |
| AMA | PTDA. Acronym Geek. February 16, 2012, 16:30. Available at: http://www.acronymgeek.com/PTDA. Accessed February 16, 2012, 16:30. |