| APA | NGL. (2012, February 9). In Acronym Geek. Retrieved 19:59, February 9, 2012, from http://www.acronymgeek.com/NGL |
| MLA | "NGL." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/NGL>. |
| MHRA | 'NGL', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/NGL> [accessed 9 February 2012] |
| Chicago | "NGL", http://www.acronymgeek.com/NGL (accessed February 9, 2012). |
| CBE/CSE | NGL [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/NGL. |
| Bluebook | NGL, http://www.acronymgeek.com/NGL (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NGL, http://www.acronymgeek.com/NGL (optional description here) (as of Feb. 9, 2012, 19:59). |
| AMA | NGL. Acronym Geek. February 9, 2012, 19:59. Available at: http://www.acronymgeek.com/NGL. Accessed February 9, 2012, 19:59. |