| APA | PYI. (2012, February 13). In Acronym Geek. Retrieved 21:07, February 13, 2012, from http://www.acronymgeek.com/PYI |
| MLA | "PYI." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/PYI>. |
| MHRA | 'PYI', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/PYI> [accessed 13 February 2012] |
| Chicago | "PYI", http://www.acronymgeek.com/PYI (accessed February 13, 2012). |
| CBE/CSE | PYI [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/PYI. |
| Bluebook | PYI, http://www.acronymgeek.com/PYI (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PYI, http://www.acronymgeek.com/PYI (optional description here) (as of Feb. 13, 2012, 21:07). |
| AMA | PYI. Acronym Geek. February 13, 2012, 21:07. Available at: http://www.acronymgeek.com/PYI. Accessed February 13, 2012, 21:07. |