| APA | P.U. (2012, February 13). In Acronym Geek. Retrieved 23:27, February 13, 2012, from http://www.acronymgeek.com/P.U |
| MLA | "P.U." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/P.U>. |
| MHRA | 'P.U', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/P.U> [accessed 13 February 2012] |
| Chicago | "P.U", http://www.acronymgeek.com/P.U (accessed February 13, 2012). |
| CBE/CSE | P.U [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/P.U. |
| Bluebook | P.U, http://www.acronymgeek.com/P.U (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, P.U, http://www.acronymgeek.com/P.U (optional description here) (as of Feb. 13, 2012, 23:27). |
| AMA | P.U. Acronym Geek. February 13, 2012, 23:27. Available at: http://www.acronymgeek.com/P.U. Accessed February 13, 2012, 23:27. |