| APA | MPEN. (2012, February 15). In Acronym Geek. Retrieved 11:43, February 15, 2012, from http://www.acronymgeek.com/MPEN |
| MLA | "MPEN." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/MPEN>. |
| MHRA | 'MPEN', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/MPEN> [accessed 15 February 2012] |
| Chicago | "MPEN", http://www.acronymgeek.com/MPEN (accessed February 15, 2012). |
| CBE/CSE | MPEN [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/MPEN. |
| Bluebook | MPEN, http://www.acronymgeek.com/MPEN (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, MPEN, http://www.acronymgeek.com/MPEN (optional description here) (as of Feb. 15, 2012, 11:43). |
| AMA | MPEN. Acronym Geek. February 15, 2012, 11:43. Available at: http://www.acronymgeek.com/MPEN. Accessed February 15, 2012, 11:43. |