| APA | CIOU. (2012, February 12). In Acronym Geek. Retrieved 10:19, February 12, 2012, from http://www.acronymgeek.com/CIOU |
| MLA | "CIOU." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/CIOU>. |
| MHRA | 'CIOU', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/CIOU> [accessed 12 February 2012] |
| Chicago | "CIOU", http://www.acronymgeek.com/CIOU (accessed February 12, 2012). |
| CBE/CSE | CIOU [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/CIOU. |
| Bluebook | CIOU, http://www.acronymgeek.com/CIOU (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, CIOU, http://www.acronymgeek.com/CIOU (optional description here) (as of Feb. 12, 2012, 10:19). |
| AMA | CIOU. Acronym Geek. February 12, 2012, 10:19. Available at: http://www.acronymgeek.com/CIOU. Accessed February 12, 2012, 10:19. |