| APA | IES. (2012, February 4). In Acronym Geek. Retrieved 12:09, February 4, 2012, from http://www.acronymgeek.com/IES |
| MLA | "IES." Acronym Geek. (2012). Acronym Geek. 4 Feb 2012 <http://www.acronymgeek.com/IES>. |
| MHRA | 'IES', Acronym Geek, 4 February 2012, <http://www.acronymgeek.com/IES> [accessed 4 February 2012] |
| Chicago | "IES", http://www.acronymgeek.com/IES (accessed February 4, 2012). |
| CBE/CSE | IES [Internet]. Acronym Geek; 2012 Feb 4 [cited 2012 Feb 4]. Available from: http://www.acronymgeek.com/IES. |
| Bluebook | IES, http://www.acronymgeek.com/IES (last visited February 4, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, IES, http://www.acronymgeek.com/IES (optional description here) (as of Feb. 4, 2012, 12:09). |
| AMA | IES. Acronym Geek. February 4, 2012, 12:09. Available at: http://www.acronymgeek.com/IES. Accessed February 4, 2012, 12:09. |