| APA | ACO. (2012, February 4). In Acronym Geek. Retrieved 11:28, February 4, 2012, from http://www.acronymgeek.com/ACO |
| MLA | "ACO." Acronym Geek. (2012). Acronym Geek. 4 Feb 2012 <http://www.acronymgeek.com/ACO>. |
| MHRA | 'ACO', Acronym Geek, 4 February 2012, <http://www.acronymgeek.com/ACO> [accessed 4 February 2012] |
| Chicago | "ACO", http://www.acronymgeek.com/ACO (accessed February 4, 2012). |
| CBE/CSE | ACO [Internet]. Acronym Geek; 2012 Feb 4 [cited 2012 Feb 4]. Available from: http://www.acronymgeek.com/ACO. |
| Bluebook | ACO, http://www.acronymgeek.com/ACO (last visited February 4, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ACO, http://www.acronymgeek.com/ACO (optional description here) (as of Feb. 4, 2012, 11:28). |
| AMA | ACO. Acronym Geek. February 4, 2012, 11:28. Available at: http://www.acronymgeek.com/ACO. Accessed February 4, 2012, 11:28. |