| APA | SNPO. (2012, February 16). In Acronym Geek. Retrieved 15:18, February 16, 2012, from http://www.acronymgeek.com/SNPO |
| MLA | "SNPO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/SNPO>. |
| MHRA | 'SNPO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/SNPO> [accessed 16 February 2012] |
| Chicago | "SNPO", http://www.acronymgeek.com/SNPO (accessed February 16, 2012). |
| CBE/CSE | SNPO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/SNPO. |
| Bluebook | SNPO, http://www.acronymgeek.com/SNPO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SNPO, http://www.acronymgeek.com/SNPO (optional description here) (as of Feb. 16, 2012, 15:18). |
| AMA | SNPO. Acronym Geek. February 16, 2012, 15:18. Available at: http://www.acronymgeek.com/SNPO. Accessed February 16, 2012, 15:18. |