| APA | PENW. (2012, February 16). In Acronym Geek. Retrieved 01:10, February 16, 2012, from http://www.acronymgeek.com/PENW |
| MLA | "PENW." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/PENW>. |
| MHRA | 'PENW', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/PENW> [accessed 16 February 2012] |
| Chicago | "PENW", http://www.acronymgeek.com/PENW (accessed February 16, 2012). |
| CBE/CSE | PENW [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/PENW. |
| Bluebook | PENW, http://www.acronymgeek.com/PENW (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PENW, http://www.acronymgeek.com/PENW (optional description here) (as of Feb. 16, 2012, 01:10). |
| AMA | PENW. Acronym Geek. February 16, 2012, 01:10. Available at: http://www.acronymgeek.com/PENW. Accessed February 16, 2012, 01:10. |