| APA | IDU. (2012, February 14). In Acronym Geek. Retrieved 20:39, February 14, 2012, from http://www.acronymgeek.com/IDU |
| MLA | "IDU." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/IDU>. |
| MHRA | 'IDU', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/IDU> [accessed 14 February 2012] |
| Chicago | "IDU", http://www.acronymgeek.com/IDU (accessed February 14, 2012). |
| CBE/CSE | IDU [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/IDU. |
| Bluebook | IDU, http://www.acronymgeek.com/IDU (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, IDU, http://www.acronymgeek.com/IDU (optional description here) (as of Feb. 14, 2012, 20:39). |
| AMA | IDU. Acronym Geek. February 14, 2012, 20:39. Available at: http://www.acronymgeek.com/IDU. Accessed February 14, 2012, 20:39. |