| APA | SPOI. (2012, February 15). In Acronym Geek. Retrieved 13:15, February 15, 2012, from http://www.acronymgeek.com/SPOI |
| MLA | "SPOI." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/SPOI>. |
| MHRA | 'SPOI', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/SPOI> [accessed 15 February 2012] |
| Chicago | "SPOI", http://www.acronymgeek.com/SPOI (accessed February 15, 2012). |
| CBE/CSE | SPOI [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/SPOI. |
| Bluebook | SPOI, http://www.acronymgeek.com/SPOI (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SPOI, http://www.acronymgeek.com/SPOI (optional description here) (as of Feb. 15, 2012, 13:15). |
| AMA | SPOI. Acronym Geek. February 15, 2012, 13:15. Available at: http://www.acronymgeek.com/SPOI. Accessed February 15, 2012, 13:15. |