| APA | PENM. (2012, February 15). In Acronym Geek. Retrieved 00:00, February 15, 2012, from http://www.acronymgeek.com/PENM |
| MLA | "PENM." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/PENM>. |
| MHRA | 'PENM', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/PENM> [accessed 15 February 2012] |
| Chicago | "PENM", http://www.acronymgeek.com/PENM (accessed February 15, 2012). |
| CBE/CSE | PENM [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/PENM. |
| Bluebook | PENM, http://www.acronymgeek.com/PENM (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PENM, http://www.acronymgeek.com/PENM (optional description here) (as of Feb. 15, 2012, 00:00). |
| AMA | PENM. Acronym Geek. February 15, 2012, 00:00. Available at: http://www.acronymgeek.com/PENM. Accessed February 15, 2012, 00:00. |