| APA | IGS. (2012, February 14). In Acronym Geek. Retrieved 04:00, February 14, 2012, from http://www.acronymgeek.com/IGS |
| MLA | "IGS." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/IGS>. |
| MHRA | 'IGS', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/IGS> [accessed 14 February 2012] |
| Chicago | "IGS", http://www.acronymgeek.com/IGS (accessed February 14, 2012). |
| CBE/CSE | IGS [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/IGS. |
| Bluebook | IGS, http://www.acronymgeek.com/IGS (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, IGS, http://www.acronymgeek.com/IGS (optional description here) (as of Feb. 14, 2012, 04:00). |
| AMA | IGS. Acronym Geek. February 14, 2012, 04:00. Available at: http://www.acronymgeek.com/IGS. Accessed February 14, 2012, 04:00. |