| Style | Reference Text |
|---|
| APA | PEN. (2012, May 27). In All Acronyms. Retrieved 02:01, May 27, 2012, from http://www.all-acronyms.com/PEN |
| MLA | "PEN." All Acronyms. 27 May 2012, 02:01. All Acronyms. 27 May 2012 <http://www.all-acronyms.com/PEN>. |
| MHRA | 'PEN', All Acronyms, 27 May 2012, 02:01, <http://www.all-acronyms.com/PEN> [accessed 27 May 2012] |
| Chicago | "PEN," http://www.all-acronyms.com/PEN (accessed May 27, 2012). |
| CBE/CSE | PEN [Internet]. All Acronyms; 2012 May 27, 02:01 [cited 2012 May 27]. Available from: http://www.all-acronyms.com/PEN. |
| Bluebook | PEN, http://www.all-acronyms.com/PEN (last visited May 27, 2012). |
| Bluebook: Harvard JOLT | See All Acronyms, PEN, http://www.all-acronyms.com/PEN (optional description here) (as of May. 27, 2012, 02:01). |
| AMA | PEN. All Acronyms. May 27, 2012, 02:01. Available at: http://www.all-acronyms.com/PEN. Accessed May 27, 2012. |
Penicillin