| APA | LPEO. (2012, February 14). In Acronym Geek. Retrieved 20:19, February 14, 2012, from http://www.acronymgeek.com/LPEO |
| MLA | "LPEO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/LPEO>. |
| MHRA | 'LPEO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/LPEO> [accessed 14 February 2012] |
| Chicago | "LPEO", http://www.acronymgeek.com/LPEO (accessed February 14, 2012). |
| CBE/CSE | LPEO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/LPEO. |
| Bluebook | LPEO, http://www.acronymgeek.com/LPEO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, LPEO, http://www.acronymgeek.com/LPEO (optional description here) (as of Feb. 14, 2012, 20:19). |
| AMA | LPEO. Acronym Geek. February 14, 2012, 20:19. Available at: http://www.acronymgeek.com/LPEO. Accessed February 14, 2012, 20:19. |