| APA | D4. (2012, February 11). In Acronym Geek. Retrieved 21:50, February 11, 2012, from http://www.acronymgeek.com/D4 |
| MLA | "D4." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/D4>. |
| MHRA | 'D4', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/D4> [accessed 11 February 2012] |
| Chicago | "D4", http://www.acronymgeek.com/D4 (accessed February 11, 2012). |
| CBE/CSE | D4 [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/D4. |
| Bluebook | D4, http://www.acronymgeek.com/D4 (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, D4, http://www.acronymgeek.com/D4 (optional description here) (as of Feb. 11, 2012, 21:50). |
| AMA | D4. Acronym Geek. February 11, 2012, 21:50. Available at: http://www.acronymgeek.com/D4. Accessed February 11, 2012, 21:50. |