| APA | P.U.. (2012, February 16). In Acronym Geek. Retrieved 22:02, February 16, 2012, from http://www.acronymgeek.com/P.U. |
| MLA | "P.U.." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/P.U.>. |
| MHRA | 'P.U.', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/P.U.> [accessed 16 February 2012] |
| Chicago | "P.U.", http://www.acronymgeek.com/P.U. (accessed February 16, 2012). |
| CBE/CSE | P.U. [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/P.U.. |
| Bluebook | P.U., http://www.acronymgeek.com/P.U. (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, P.U., http://www.acronymgeek.com/P.U. (optional description here) (as of Feb. 16, 2012, 22:02). |
| AMA | P.U.. Acronym Geek. February 16, 2012, 22:02. Available at: http://www.acronymgeek.com/P.U.. Accessed February 16, 2012, 22:02. |