| APA | PNBD. (2012, February 15). In Acronym Geek. Retrieved 13:04, February 15, 2012, from http://www.acronymgeek.com/PNBD |
| MLA | "PNBD." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/PNBD>. |
| MHRA | 'PNBD', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/PNBD> [accessed 15 February 2012] |
| Chicago | "PNBD", http://www.acronymgeek.com/PNBD (accessed February 15, 2012). |
| CBE/CSE | PNBD [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/PNBD. |
| Bluebook | PNBD, http://www.acronymgeek.com/PNBD (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PNBD, http://www.acronymgeek.com/PNBD (optional description here) (as of Feb. 15, 2012, 13:04). |
| AMA | PNBD. Acronym Geek. February 15, 2012, 13:04. Available at: http://www.acronymgeek.com/PNBD. Accessed February 15, 2012, 13:04. |