| APA | HIFO. (2012, February 12). In Acronym Geek. Retrieved 07:10, February 12, 2012, from http://www.acronymgeek.com/HIFO |
| MLA | "HIFO." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/HIFO>. |
| MHRA | 'HIFO', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/HIFO> [accessed 12 February 2012] |
| Chicago | "HIFO", http://www.acronymgeek.com/HIFO (accessed February 12, 2012). |
| CBE/CSE | HIFO [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/HIFO. |
| Bluebook | HIFO, http://www.acronymgeek.com/HIFO (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HIFO, http://www.acronymgeek.com/HIFO (optional description here) (as of Feb. 12, 2012, 07:10). |
| AMA | HIFO. Acronym Geek. February 12, 2012, 07:10. Available at: http://www.acronymgeek.com/HIFO. Accessed February 12, 2012, 07:10. |