| APA | POR-SI. (2012, February 12). In Acronym Geek. Retrieved 15:25, February 12, 2012, from http://www.acronymgeek.com/POR-SI |
| MLA | "POR-SI." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/POR-SI>. |
| MHRA | 'POR-SI', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/POR-SI> [accessed 12 February 2012] |
| Chicago | "POR-SI", http://www.acronymgeek.com/POR-SI (accessed February 12, 2012). |
| CBE/CSE | POR-SI [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/POR-SI. |
| Bluebook | POR-SI, http://www.acronymgeek.com/POR-SI (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, POR-SI, http://www.acronymgeek.com/POR-SI (optional description here) (as of Feb. 12, 2012, 15:25). |
| AMA | POR-SI. Acronym Geek. February 12, 2012, 15:25. Available at: http://www.acronymgeek.com/POR-SI. Accessed February 12, 2012, 15:25. |