| APA | PDEO. (2012, February 16). In Acronym Geek. Retrieved 09:38, February 16, 2012, from http://www.acronymgeek.com/PDEO |
| MLA | "PDEO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/PDEO>. |
| MHRA | 'PDEO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/PDEO> [accessed 16 February 2012] |
| Chicago | "PDEO", http://www.acronymgeek.com/PDEO (accessed February 16, 2012). |
| CBE/CSE | PDEO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/PDEO. |
| Bluebook | PDEO, http://www.acronymgeek.com/PDEO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PDEO, http://www.acronymgeek.com/PDEO (optional description here) (as of Feb. 16, 2012, 09:38). |
| AMA | PDEO. Acronym Geek. February 16, 2012, 09:38. Available at: http://www.acronymgeek.com/PDEO. Accessed February 16, 2012, 09:38. |