| APA | ABO. (2012, February 10). In Acronym Geek. Retrieved 07:23, February 10, 2012, from http://www.acronymgeek.com/ABO |
| MLA | "ABO." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/ABO>. |
| MHRA | 'ABO', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/ABO> [accessed 10 February 2012] |
| Chicago | "ABO", http://www.acronymgeek.com/ABO (accessed February 10, 2012). |
| CBE/CSE | ABO [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/ABO. |
| Bluebook | ABO, http://www.acronymgeek.com/ABO (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ABO, http://www.acronymgeek.com/ABO (optional description here) (as of Feb. 10, 2012, 07:23). |
| AMA | ABO. Acronym Geek. February 10, 2012, 07:23. Available at: http://www.acronymgeek.com/ABO. Accessed February 10, 2012, 07:23. |