| APA | PENB. (2012, February 15). In Acronym Geek. Retrieved 21:45, February 15, 2012, from http://www.acronymgeek.com/PENB |
| MLA | "PENB." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/PENB>. |
| MHRA | 'PENB', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/PENB> [accessed 15 February 2012] |
| Chicago | "PENB", http://www.acronymgeek.com/PENB (accessed February 15, 2012). |
| CBE/CSE | PENB [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/PENB. |
| Bluebook | PENB, http://www.acronymgeek.com/PENB (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PENB, http://www.acronymgeek.com/PENB (optional description here) (as of Feb. 15, 2012, 21:45). |
| AMA | PENB. Acronym Geek. February 15, 2012, 21:45. Available at: http://www.acronymgeek.com/PENB. Accessed February 15, 2012, 21:45. |