| APA | CPYO. (2012, February 10). In Acronym Geek. Retrieved 08:00, February 10, 2012, from http://www.acronymgeek.com/CPYO |
| MLA | "CPYO." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/CPYO>. |
| MHRA | 'CPYO', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/CPYO> [accessed 10 February 2012] |
| Chicago | "CPYO", http://www.acronymgeek.com/CPYO (accessed February 10, 2012). |
| CBE/CSE | CPYO [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/CPYO. |
| Bluebook | CPYO, http://www.acronymgeek.com/CPYO (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, CPYO, http://www.acronymgeek.com/CPYO (optional description here) (as of Feb. 10, 2012, 08:00). |
| AMA | CPYO. Acronym Geek. February 10, 2012, 08:00. Available at: http://www.acronymgeek.com/CPYO. Accessed February 10, 2012, 08:00. |