| APA | HSI. (2012, February 14). In Acronym Geek. Retrieved 09:51, February 14, 2012, from http://www.acronymgeek.com/HSI |
| MLA | "HSI." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HSI>. |
| MHRA | 'HSI', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HSI> [accessed 14 February 2012] |
| Chicago | "HSI", http://www.acronymgeek.com/HSI (accessed February 14, 2012). |
| CBE/CSE | HSI [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HSI. |
| Bluebook | HSI, http://www.acronymgeek.com/HSI (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HSI, http://www.acronymgeek.com/HSI (optional description here) (as of Feb. 14, 2012, 09:51). |
| AMA | HSI. Acronym Geek. February 14, 2012, 09:51. Available at: http://www.acronymgeek.com/HSI. Accessed February 14, 2012, 09:51. |