| APA | PIYS. (2012, February 16). In Acronym Geek. Retrieved 23:48, February 16, 2012, from http://www.acronymgeek.com/PIYS |
| MLA | "PIYS." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/PIYS>. |
| MHRA | 'PIYS', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/PIYS> [accessed 16 February 2012] |
| Chicago | "PIYS", http://www.acronymgeek.com/PIYS (accessed February 16, 2012). |
| CBE/CSE | PIYS [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/PIYS. |
| Bluebook | PIYS, http://www.acronymgeek.com/PIYS (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PIYS, http://www.acronymgeek.com/PIYS (optional description here) (as of Feb. 16, 2012, 23:48). |
| AMA | PIYS. Acronym Geek. February 16, 2012, 23:48. Available at: http://www.acronymgeek.com/PIYS. Accessed February 16, 2012, 23:48. |