| APA | PUTO. (2012, February 14). In Acronym Geek. Retrieved 19:09, February 14, 2012, from http://www.acronymgeek.com/PUTO |
| MLA | "PUTO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PUTO>. |
| MHRA | 'PUTO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PUTO> [accessed 14 February 2012] |
| Chicago | "PUTO", http://www.acronymgeek.com/PUTO (accessed February 14, 2012). |
| CBE/CSE | PUTO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PUTO. |
| Bluebook | PUTO, http://www.acronymgeek.com/PUTO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PUTO, http://www.acronymgeek.com/PUTO (optional description here) (as of Feb. 14, 2012, 19:09). |
| AMA | PUTO. Acronym Geek. February 14, 2012, 19:09. Available at: http://www.acronymgeek.com/PUTO. Accessed February 14, 2012, 19:09. |