| APA | XPIS. (2012, February 17). In Acronym Geek. Retrieved 06:54, February 17, 2012, from http://www.acronymgeek.com/XPIS |
| MLA | "XPIS." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/XPIS>. |
| MHRA | 'XPIS', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/XPIS> [accessed 17 February 2012] |
| Chicago | "XPIS", http://www.acronymgeek.com/XPIS (accessed February 17, 2012). |
| CBE/CSE | XPIS [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/XPIS. |
| Bluebook | XPIS, http://www.acronymgeek.com/XPIS (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, XPIS, http://www.acronymgeek.com/XPIS (optional description here) (as of Feb. 17, 2012, 06:54). |
| AMA | XPIS. Acronym Geek. February 17, 2012, 06:54. Available at: http://www.acronymgeek.com/XPIS. Accessed February 17, 2012, 06:54. |