| APA | DIFO. (2012, February 16). In Acronym Geek. Retrieved 05:10, February 16, 2012, from http://www.acronymgeek.com/DIFO |
| MLA | "DIFO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/DIFO>. |
| MHRA | 'DIFO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/DIFO> [accessed 16 February 2012] |
| Chicago | "DIFO", http://www.acronymgeek.com/DIFO (accessed February 16, 2012). |
| CBE/CSE | DIFO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/DIFO. |
| Bluebook | DIFO, http://www.acronymgeek.com/DIFO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DIFO, http://www.acronymgeek.com/DIFO (optional description here) (as of Feb. 16, 2012, 05:10). |
| AMA | DIFO. Acronym Geek. February 16, 2012, 05:10. Available at: http://www.acronymgeek.com/DIFO. Accessed February 16, 2012, 05:10. |