| APA | SPEK. (2012, February 14). In Acronym Geek. Retrieved 12:42, February 14, 2012, from http://www.acronymgeek.com/SPEK |
| MLA | "SPEK." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/SPEK>. |
| MHRA | 'SPEK', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/SPEK> [accessed 14 February 2012] |
| Chicago | "SPEK", http://www.acronymgeek.com/SPEK (accessed February 14, 2012). |
| CBE/CSE | SPEK [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/SPEK. |
| Bluebook | SPEK, http://www.acronymgeek.com/SPEK (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SPEK, http://www.acronymgeek.com/SPEK (optional description here) (as of Feb. 14, 2012, 12:42). |
| AMA | SPEK. Acronym Geek. February 14, 2012, 12:42. Available at: http://www.acronymgeek.com/SPEK. Accessed February 14, 2012, 12:42. |