| APA | PE. (2012, February 14). In Acronym Geek. Retrieved 06:49, February 14, 2012, from http://www.acronymgeek.com/PE |
| MLA | "PE." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PE>. |
| MHRA | 'PE', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PE> [accessed 14 February 2012] |
| Chicago | "PE", http://www.acronymgeek.com/PE (accessed February 14, 2012). |
| CBE/CSE | PE [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PE. |
| Bluebook | PE, http://www.acronymgeek.com/PE (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PE, http://www.acronymgeek.com/PE (optional description here) (as of Feb. 14, 2012, 06:49). |
| AMA | PE. Acronym Geek. February 14, 2012, 06:49. Available at: http://www.acronymgeek.com/PE. Accessed February 14, 2012, 06:49. |