| APA | PEU. (2012, February 14). In Acronym Geek. Retrieved 07:12, February 14, 2012, from http://www.acronymgeek.com/PEU |
| MLA | "PEU." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PEU>. |
| MHRA | 'PEU', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PEU> [accessed 14 February 2012] |
| Chicago | "PEU", http://www.acronymgeek.com/PEU (accessed February 14, 2012). |
| CBE/CSE | PEU [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PEU. |
| Bluebook | PEU, http://www.acronymgeek.com/PEU (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PEU, http://www.acronymgeek.com/PEU (optional description here) (as of Feb. 14, 2012, 07:12). |
| AMA | PEU. Acronym Geek. February 14, 2012, 07:12. Available at: http://www.acronymgeek.com/PEU. Accessed February 14, 2012, 07:12. |