| APA | CPO. (2012, February 14). In Acronym Geek. Retrieved 09:26, February 14, 2012, from http://www.acronymgeek.com/CPO |
| MLA | "CPO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/CPO>. |
| MHRA | 'CPO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/CPO> [accessed 14 February 2012] |
| Chicago | "CPO", http://www.acronymgeek.com/CPO (accessed February 14, 2012). |
| CBE/CSE | CPO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/CPO. |
| Bluebook | CPO, http://www.acronymgeek.com/CPO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, CPO, http://www.acronymgeek.com/CPO (optional description here) (as of Feb. 14, 2012, 09:26). |
| AMA | CPO. Acronym Geek. February 14, 2012, 09:26. Available at: http://www.acronymgeek.com/CPO. Accessed February 14, 2012, 09:26. |