| APA | 4ID. (2012, February 11). In Acronym Geek. Retrieved 22:01, February 11, 2012, from http://www.acronymgeek.com/4ID |
| MLA | "4ID." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/4ID>. |
| MHRA | '4ID', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/4ID> [accessed 11 February 2012] |
| Chicago | "4ID", http://www.acronymgeek.com/4ID (accessed February 11, 2012). |
| CBE/CSE | 4ID [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/4ID. |
| Bluebook | 4ID, http://www.acronymgeek.com/4ID (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, 4ID, http://www.acronymgeek.com/4ID (optional description here) (as of Feb. 11, 2012, 22:01). |
| AMA | 4ID. Acronym Geek. February 11, 2012, 22:01. Available at: http://www.acronymgeek.com/4ID. Accessed February 11, 2012, 22:01. |