| APA | CHOA. (2012, February 16). In Acronym Geek. Retrieved 12:51, February 16, 2012, from http://www.acronymgeek.com/CHOA |
| MLA | "CHOA." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/CHOA>. |
| MHRA | 'CHOA', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/CHOA> [accessed 16 February 2012] |
| Chicago | "CHOA", http://www.acronymgeek.com/CHOA (accessed February 16, 2012). |
| CBE/CSE | CHOA [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/CHOA. |
| Bluebook | CHOA, http://www.acronymgeek.com/CHOA (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, CHOA, http://www.acronymgeek.com/CHOA (optional description here) (as of Feb. 16, 2012, 12:51). |
| AMA | CHOA. Acronym Geek. February 16, 2012, 12:51. Available at: http://www.acronymgeek.com/CHOA. Accessed February 16, 2012, 12:51. |