| APA | POPU. (2012, February 17). In Acronym Geek. Retrieved 00:28, February 17, 2012, from http://www.acronymgeek.com/POPU |
| MLA | "POPU." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/POPU>. |
| MHRA | 'POPU', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/POPU> [accessed 17 February 2012] |
| Chicago | "POPU", http://www.acronymgeek.com/POPU (accessed February 17, 2012). |
| CBE/CSE | POPU [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/POPU. |
| Bluebook | POPU, http://www.acronymgeek.com/POPU (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, POPU, http://www.acronymgeek.com/POPU (optional description here) (as of Feb. 17, 2012, 00:28). |
| AMA | POPU. Acronym Geek. February 17, 2012, 00:28. Available at: http://www.acronymgeek.com/POPU. Accessed February 17, 2012, 00:28. |