| APA | P1D. (2012, February 15). In Acronym Geek. Retrieved 03:23, February 15, 2012, from http://www.acronymgeek.com/P1D |
| MLA | "P1D." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/P1D>. |
| MHRA | 'P1D', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/P1D> [accessed 15 February 2012] |
| Chicago | "P1D", http://www.acronymgeek.com/P1D (accessed February 15, 2012). |
| CBE/CSE | P1D [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/P1D. |
| Bluebook | P1D, http://www.acronymgeek.com/P1D (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, P1D, http://www.acronymgeek.com/P1D (optional description here) (as of Feb. 15, 2012, 03:23). |
| AMA | P1D. Acronym Geek. February 15, 2012, 03:23. Available at: http://www.acronymgeek.com/P1D. Accessed February 15, 2012, 03:23. |