| APA | 4DDA. (2012, February 11). In Acronym Geek. Retrieved 21:18, February 11, 2012, from http://www.acronymgeek.com/4DDA |
| MLA | "4DDA." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/4DDA>. |
| MHRA | '4DDA', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/4DDA> [accessed 11 February 2012] |
| Chicago | "4DDA", http://www.acronymgeek.com/4DDA (accessed February 11, 2012). |
| CBE/CSE | 4DDA [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/4DDA. |
| Bluebook | 4DDA, http://www.acronymgeek.com/4DDA (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, 4DDA, http://www.acronymgeek.com/4DDA (optional description here) (as of Feb. 11, 2012, 21:18). |
| AMA | 4DDA. Acronym Geek. February 11, 2012, 21:18. Available at: http://www.acronymgeek.com/4DDA. Accessed February 11, 2012, 21:18. |