| APA | SOPREN. (2012, February 11). In Acronym Geek. Retrieved 17:19, February 11, 2012, from http://www.acronymgeek.com/SOPREN |
| MLA | "SOPREN." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/SOPREN>. |
| MHRA | 'SOPREN', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/SOPREN> [accessed 11 February 2012] |
| Chicago | "SOPREN", http://www.acronymgeek.com/SOPREN (accessed February 11, 2012). |
| CBE/CSE | SOPREN [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/SOPREN. |
| Bluebook | SOPREN, http://www.acronymgeek.com/SOPREN (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SOPREN, http://www.acronymgeek.com/SOPREN (optional description here) (as of Feb. 11, 2012, 17:19). |
| AMA | SOPREN. Acronym Geek. February 11, 2012, 17:19. Available at: http://www.acronymgeek.com/SOPREN. Accessed February 11, 2012, 17:19. |