| APA | PENZ. (2012, February 14). In Acronym Geek. Retrieved 18:32, February 14, 2012, from http://www.acronymgeek.com/PENZ |
| MLA | "PENZ." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PENZ>. |
| MHRA | 'PENZ', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PENZ> [accessed 14 February 2012] |
| Chicago | "PENZ", http://www.acronymgeek.com/PENZ (accessed February 14, 2012). |
| CBE/CSE | PENZ [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PENZ. |
| Bluebook | PENZ, http://www.acronymgeek.com/PENZ (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PENZ, http://www.acronymgeek.com/PENZ (optional description here) (as of Feb. 14, 2012, 18:32). |
| AMA | PENZ. Acronym Geek. February 14, 2012, 18:32. Available at: http://www.acronymgeek.com/PENZ. Accessed February 14, 2012, 18:32. |