| APA | SPRF. (2012, February 15). In Acronym Geek. Retrieved 12:41, February 15, 2012, from http://www.acronymgeek.com/SPRF |
| MLA | "SPRF." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/SPRF>. |
| MHRA | 'SPRF', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/SPRF> [accessed 15 February 2012] |
| Chicago | "SPRF", http://www.acronymgeek.com/SPRF (accessed February 15, 2012). |
| CBE/CSE | SPRF [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/SPRF. |
| Bluebook | SPRF, http://www.acronymgeek.com/SPRF (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SPRF, http://www.acronymgeek.com/SPRF (optional description here) (as of Feb. 15, 2012, 12:41). |
| AMA | SPRF. Acronym Geek. February 15, 2012, 12:41. Available at: http://www.acronymgeek.com/SPRF. Accessed February 15, 2012, 12:41. |