| APA | SPKI. (2012, February 14). In Acronym Geek. Retrieved 00:03, February 14, 2012, from http://www.acronymgeek.com/SPKI |
| MLA | "SPKI." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/SPKI>. |
| MHRA | 'SPKI', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/SPKI> [accessed 14 February 2012] |
| Chicago | "SPKI", http://www.acronymgeek.com/SPKI (accessed February 14, 2012). |
| CBE/CSE | SPKI [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/SPKI. |
| Bluebook | SPKI, http://www.acronymgeek.com/SPKI (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SPKI, http://www.acronymgeek.com/SPKI (optional description here) (as of Feb. 14, 2012, 00:03). |
| AMA | SPKI. Acronym Geek. February 14, 2012, 00:03. Available at: http://www.acronymgeek.com/SPKI. Accessed February 14, 2012, 00:03. |