| APA | ICU. (2012, February 9). In Acronym Geek. Retrieved 00:10, February 9, 2012, from http://www.acronymgeek.com/ICU |
| MLA | "ICU." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/ICU>. |
| MHRA | 'ICU', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/ICU> [accessed 9 February 2012] |
| Chicago | "ICU", http://www.acronymgeek.com/ICU (accessed February 9, 2012). |
| CBE/CSE | ICU [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/ICU. |
| Bluebook | ICU, http://www.acronymgeek.com/ICU (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ICU, http://www.acronymgeek.com/ICU (optional description here) (as of Feb. 9, 2012, 00:10). |
| AMA | ICU. Acronym Geek. February 9, 2012, 00:10. Available at: http://www.acronymgeek.com/ICU. Accessed February 9, 2012, 00:10. |