| APA | I/O. (2012, February 9). In Acronym Geek. Retrieved 21:43, February 9, 2012, from http://www.acronymgeek.com/I/O |
| MLA | "I/O." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/I/O>. |
| MHRA | 'I/O', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/I/O> [accessed 9 February 2012] |
| Chicago | "I/O", http://www.acronymgeek.com/I/O (accessed February 9, 2012). |
| CBE/CSE | I/O [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/I/O. |
| Bluebook | I/O, http://www.acronymgeek.com/I/O (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, I/O, http://www.acronymgeek.com/I/O (optional description here) (as of Feb. 9, 2012, 21:43). |
| AMA | I/O. Acronym Geek. February 9, 2012, 21:43. Available at: http://www.acronymgeek.com/I/O. Accessed February 9, 2012, 21:43. |