| Style | Reference Text |
|---|
| APA | CPEN. (2012, May 25). In All Acronyms. Retrieved 11:25, May 25, 2012, from http://www.all-acronyms.com/CPEN |
| MLA | "CPEN." All Acronyms. 25 May 2012, 11:25. All Acronyms. 25 May 2012 <http://www.all-acronyms.com/CPEN>. |
| MHRA | 'CPEN', All Acronyms, 25 May 2012, 11:25, <http://www.all-acronyms.com/CPEN> [accessed 25 May 2012] |
| Chicago | "CPEN," http://www.all-acronyms.com/CPEN (accessed May 25, 2012). |
| CBE/CSE | CPEN [Internet]. All Acronyms; 2012 May 25, 11:25 [cited 2012 May 25]. Available from: http://www.all-acronyms.com/CPEN. |
| Bluebook | CPEN, http://www.all-acronyms.com/CPEN (last visited May 25, 2012). |
| Bluebook: Harvard JOLT | See All Acronyms, CPEN, http://www.all-acronyms.com/CPEN (optional description here) (as of May. 25, 2012, 11:25). |
| AMA | CPEN. All Acronyms. May 25, 2012, 11:25. Available at: http://www.all-acronyms.com/CPEN. Accessed May 25, 2012. |
Cardamine pensylvanica