| APA | UPU. (2012, February 14). In Acronym Geek. Retrieved 07:38, February 14, 2012, from http://www.acronymgeek.com/UPU |
| MLA | "UPU." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/UPU>. |
| MHRA | 'UPU', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/UPU> [accessed 14 February 2012] |
| Chicago | "UPU", http://www.acronymgeek.com/UPU (accessed February 14, 2012). |
| CBE/CSE | UPU [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/UPU. |
| Bluebook | UPU, http://www.acronymgeek.com/UPU (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, UPU, http://www.acronymgeek.com/UPU (optional description here) (as of Feb. 14, 2012, 07:38). |
| AMA | UPU. Acronym Geek. February 14, 2012, 07:38. Available at: http://www.acronymgeek.com/UPU. Accessed February 14, 2012, 07:38. |