| APA | 2DF. (2012, February 11). In Acronym Geek. Retrieved 22:35, February 11, 2012, from http://www.acronymgeek.com/2DF |
| MLA | "2DF." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/2DF>. |
| MHRA | '2DF', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/2DF> [accessed 11 February 2012] |
| Chicago | "2DF", http://www.acronymgeek.com/2DF (accessed February 11, 2012). |
| CBE/CSE | 2DF [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/2DF. |
| Bluebook | 2DF, http://www.acronymgeek.com/2DF (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, 2DF, http://www.acronymgeek.com/2DF (optional description here) (as of Feb. 11, 2012, 22:35). |
| AMA | 2DF. Acronym Geek. February 11, 2012, 22:35. Available at: http://www.acronymgeek.com/2DF. Accessed February 11, 2012, 22:35. |