| APA | SPPI. (2012, February 12). In Acronym Geek. Retrieved 01:35, February 12, 2012, from http://www.acronymgeek.com/SPPI |
| MLA | "SPPI." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/SPPI>. |
| MHRA | 'SPPI', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/SPPI> [accessed 12 February 2012] |
| Chicago | "SPPI", http://www.acronymgeek.com/SPPI (accessed February 12, 2012). |
| CBE/CSE | SPPI [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/SPPI. |
| Bluebook | SPPI, http://www.acronymgeek.com/SPPI (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SPPI, http://www.acronymgeek.com/SPPI (optional description here) (as of Feb. 12, 2012, 01:35). |
| AMA | SPPI. Acronym Geek. February 12, 2012, 01:35. Available at: http://www.acronymgeek.com/SPPI. Accessed February 12, 2012, 01:35. |