| APA | D4E. (2012, February 14). In Acronym Geek. Retrieved 10:01, February 14, 2012, from http://www.acronymgeek.com/D4E |
| MLA | "D4E." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/D4E>. |
| MHRA | 'D4E', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/D4E> [accessed 14 February 2012] |
| Chicago | "D4E", http://www.acronymgeek.com/D4E (accessed February 14, 2012). |
| CBE/CSE | D4E [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/D4E. |
| Bluebook | D4E, http://www.acronymgeek.com/D4E (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, D4E, http://www.acronymgeek.com/D4E (optional description here) (as of Feb. 14, 2012, 10:01). |
| AMA | D4E. Acronym Geek. February 14, 2012, 10:01. Available at: http://www.acronymgeek.com/D4E. Accessed February 14, 2012, 10:01. |