| APA | P.S.. (2012, February 12). In Acronym Geek. Retrieved 12:59, February 12, 2012, from http://www.acronymgeek.com/P.S. |
| MLA | "P.S.." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/P.S.>. |
| MHRA | 'P.S.', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/P.S.> [accessed 12 February 2012] |
| Chicago | "P.S.", http://www.acronymgeek.com/P.S. (accessed February 12, 2012). |
| CBE/CSE | P.S. [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/P.S.. |
| Bluebook | P.S., http://www.acronymgeek.com/P.S. (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, P.S., http://www.acronymgeek.com/P.S. (optional description here) (as of Feb. 12, 2012, 12:59). |
| AMA | P.S.. Acronym Geek. February 12, 2012, 12:59. Available at: http://www.acronymgeek.com/P.S.. Accessed February 12, 2012, 12:59. |