| APA | PNBU. (2012, February 14). In Acronym Geek. Retrieved 18:41, February 14, 2012, from http://www.acronymgeek.com/PNBU |
| MLA | "PNBU." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PNBU>. |
| MHRA | 'PNBU', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PNBU> [accessed 14 February 2012] |
| Chicago | "PNBU", http://www.acronymgeek.com/PNBU (accessed February 14, 2012). |
| CBE/CSE | PNBU [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PNBU. |
| Bluebook | PNBU, http://www.acronymgeek.com/PNBU (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PNBU, http://www.acronymgeek.com/PNBU (optional description here) (as of Feb. 14, 2012, 18:41). |
| AMA | PNBU. Acronym Geek. February 14, 2012, 18:41. Available at: http://www.acronymgeek.com/PNBU. Accessed February 14, 2012, 18:41. |