| APA | PENC. (2012, February 15). In Acronym Geek. Retrieved 19:55, February 15, 2012, from http://www.acronymgeek.com/PENC |
| MLA | "PENC." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/PENC>. |
| MHRA | 'PENC', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/PENC> [accessed 15 February 2012] |
| Chicago | "PENC", http://www.acronymgeek.com/PENC (accessed February 15, 2012). |
| CBE/CSE | PENC [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/PENC. |
| Bluebook | PENC, http://www.acronymgeek.com/PENC (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PENC, http://www.acronymgeek.com/PENC (optional description here) (as of Feb. 15, 2012, 19:55). |
| AMA | PENC. Acronym Geek. February 15, 2012, 19:55. Available at: http://www.acronymgeek.com/PENC. Accessed February 15, 2012, 19:55. |