| APA | SPE/SPI. (2012, February 10). In Acronym Geek. Retrieved 10:09, February 10, 2012, from http://www.acronymgeek.com/SPE/SPI |
| MLA | "SPE/SPI." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/SPE/SPI>. |
| MHRA | 'SPE/SPI', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/SPE/SPI> [accessed 10 February 2012] |
| Chicago | "SPE/SPI", http://www.acronymgeek.com/SPE/SPI (accessed February 10, 2012). |
| CBE/CSE | SPE/SPI [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/SPE/SPI. |
| Bluebook | SPE/SPI, http://www.acronymgeek.com/SPE/SPI (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SPE/SPI, http://www.acronymgeek.com/SPE/SPI (optional description here) (as of Feb. 10, 2012, 10:09). |
| AMA | SPE/SPI. Acronym Geek. February 10, 2012, 10:09. Available at: http://www.acronymgeek.com/SPE/SPI. Accessed February 10, 2012, 10:09. |