| APA | NGOP. (2012, February 17). In Acronym Geek. Retrieved 05:53, February 17, 2012, from http://www.acronymgeek.com/NGOP |
| MLA | "NGOP." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/NGOP>. |
| MHRA | 'NGOP', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/NGOP> [accessed 17 February 2012] |
| Chicago | "NGOP", http://www.acronymgeek.com/NGOP (accessed February 17, 2012). |
| CBE/CSE | NGOP [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/NGOP. |
| Bluebook | NGOP, http://www.acronymgeek.com/NGOP (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, NGOP, http://www.acronymgeek.com/NGOP (optional description here) (as of Feb. 17, 2012, 05:53). |
| AMA | NGOP. Acronym Geek. February 17, 2012, 05:53. Available at: http://www.acronymgeek.com/NGOP. Accessed February 17, 2012, 05:53. |