| APA | P4S. (2012, February 14). In Acronym Geek. Retrieved 04:11, February 14, 2012, from http://www.acronymgeek.com/P4S |
| MLA | "P4S." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/P4S>. |
| MHRA | 'P4S', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/P4S> [accessed 14 February 2012] |
| Chicago | "P4S", http://www.acronymgeek.com/P4S (accessed February 14, 2012). |
| CBE/CSE | P4S [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/P4S. |
| Bluebook | P4S, http://www.acronymgeek.com/P4S (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, P4S, http://www.acronymgeek.com/P4S (optional description here) (as of Feb. 14, 2012, 04:11). |
| AMA | P4S. Acronym Geek. February 14, 2012, 04:11. Available at: http://www.acronymgeek.com/P4S. Accessed February 14, 2012, 04:11. |