| APA | UNDL. (2012, February 15). In Acronym Geek. Retrieved 07:45, February 15, 2012, from http://www.acronymgeek.com/UNDL |
| MLA | "UNDL." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/UNDL>. |
| MHRA | 'UNDL', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/UNDL> [accessed 15 February 2012] |
| Chicago | "UNDL", http://www.acronymgeek.com/UNDL (accessed February 15, 2012). |
| CBE/CSE | UNDL [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/UNDL. |
| Bluebook | UNDL, http://www.acronymgeek.com/UNDL (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, UNDL, http://www.acronymgeek.com/UNDL (optional description here) (as of Feb. 15, 2012, 07:45). |
| AMA | UNDL. Acronym Geek. February 15, 2012, 07:45. Available at: http://www.acronymgeek.com/UNDL. Accessed February 15, 2012, 07:45. |