| APA | HFS. (2012, February 13). In Acronym Geek. Retrieved 21:19, February 13, 2012, from http://www.acronymgeek.com/HFS |
| MLA | "HFS." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/HFS>. |
| MHRA | 'HFS', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/HFS> [accessed 13 February 2012] |
| Chicago | "HFS", http://www.acronymgeek.com/HFS (accessed February 13, 2012). |
| CBE/CSE | HFS [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/HFS. |
| Bluebook | HFS, http://www.acronymgeek.com/HFS (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HFS, http://www.acronymgeek.com/HFS (optional description here) (as of Feb. 13, 2012, 21:19). |
| AMA | HFS. Acronym Geek. February 13, 2012, 21:19. Available at: http://www.acronymgeek.com/HFS. Accessed February 13, 2012, 21:19. |