| APA | POSI. (2012, February 17). In Acronym Geek. Retrieved 00:36, February 17, 2012, from http://www.acronymgeek.com/POSI |
| MLA | "POSI." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/POSI>. |
| MHRA | 'POSI', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/POSI> [accessed 17 February 2012] |
| Chicago | "POSI", http://www.acronymgeek.com/POSI (accessed February 17, 2012). |
| CBE/CSE | POSI [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/POSI. |
| Bluebook | POSI, http://www.acronymgeek.com/POSI (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, POSI, http://www.acronymgeek.com/POSI (optional description here) (as of Feb. 17, 2012, 00:36). |
| AMA | POSI. Acronym Geek. February 17, 2012, 00:36. Available at: http://www.acronymgeek.com/POSI. Accessed February 17, 2012, 00:36. |