| APA | QSI. (2012, February 15). In Acronym Geek. Retrieved 03:19, February 15, 2012, from http://www.acronymgeek.com/QSI |
| MLA | "QSI." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/QSI>. |
| MHRA | 'QSI', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/QSI> [accessed 15 February 2012] |
| Chicago | "QSI", http://www.acronymgeek.com/QSI (accessed February 15, 2012). |
| CBE/CSE | QSI [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/QSI. |
| Bluebook | QSI, http://www.acronymgeek.com/QSI (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, QSI, http://www.acronymgeek.com/QSI (optional description here) (as of Feb. 15, 2012, 03:19). |
| AMA | QSI. Acronym Geek. February 15, 2012, 03:19. Available at: http://www.acronymgeek.com/QSI. Accessed February 15, 2012, 03:19. |