| Style | Reference Text |
|---|
| APA | PEN. (2010, March 16). In Acronym Geek. Retrieved 18:30, March 16, 2010, from http://www.acronymgeek.com/PEN |
| MLA | "PEN." Acronym Geek. 16 Mar 2010, 18:30. Acronym Geek. 16 Mar 2010 <http://www.acronymgeek.com/PEN>. |
| MHRA | 'PEN', Acronym Geek, 16 March 2010, 18:30, <http://www.acronymgeek.com/PEN> [accessed 16 March 2010] |
| Chicago | "PEN," http://www.acronymgeek.com/PEN (accessed March 16, 2010). |
| CBE/CSE | PEN [Internet]. Acronym Geek; 2010 Mar 16, 18:30 [cited 2010 Mar 16]. Available from: http://www.acronymgeek.com/PEN. |
| Bluebook | PEN, http://www.acronymgeek.com/PEN (last visited March 16, 2010). |
| Bluebook: Harvard JOLT | See Acronym Geek, PEN, http://www.acronymgeek.com/PEN (optional description here) (as of Mar. 16, 2010, 18:30). |
| AMA | PEN. Acronym Geek. March 16, 2010, 18:30. Available at: http://www.acronymgeek.com/PEN. Accessed March 16, 2010. |
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