| APA | IOS. (2012, February 14). In Acronym Geek. Retrieved 09:48, February 14, 2012, from http://www.acronymgeek.com/IOS |
| MLA | "IOS." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/IOS>. |
| MHRA | 'IOS', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/IOS> [accessed 14 February 2012] |
| Chicago | "IOS", http://www.acronymgeek.com/IOS (accessed February 14, 2012). |
| CBE/CSE | IOS [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/IOS. |
| Bluebook | IOS, http://www.acronymgeek.com/IOS (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, IOS, http://www.acronymgeek.com/IOS (optional description here) (as of Feb. 14, 2012, 09:48). |
| AMA | IOS. Acronym Geek. February 14, 2012, 09:48. Available at: http://www.acronymgeek.com/IOS. Accessed February 14, 2012, 09:48. |