| APA | NDUL. (2012, February 14). In Acronym Geek. Retrieved 20:26, February 14, 2012, from http://www.acronymgeek.com/NDUL |
| MLA | "NDUL." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/NDUL>. |
| MHRA | 'NDUL', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/NDUL> [accessed 14 February 2012] |
| Chicago | "NDUL", http://www.acronymgeek.com/NDUL (accessed February 14, 2012). |
| CBE/CSE | NDUL [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/NDUL. |
| Bluebook | NDUL, http://www.acronymgeek.com/NDUL (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NDUL, http://www.acronymgeek.com/NDUL (optional description here) (as of Feb. 14, 2012, 20:26). |
| AMA | NDUL. Acronym Geek. February 14, 2012, 20:26. Available at: http://www.acronymgeek.com/NDUL. Accessed February 14, 2012, 20:26. |