| APA | SPR. (2012, February 14). In Acronym Geek. Retrieved 10:05, February 14, 2012, from http://www.acronymgeek.com/SPR |
| MLA | "SPR." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/SPR>. |
| MHRA | 'SPR', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/SPR> [accessed 14 February 2012] |
| Chicago | "SPR", http://www.acronymgeek.com/SPR (accessed February 14, 2012). |
| CBE/CSE | SPR [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/SPR. |
| Bluebook | SPR, http://www.acronymgeek.com/SPR (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SPR, http://www.acronymgeek.com/SPR (optional description here) (as of Feb. 14, 2012, 10:05). |
| AMA | SPR. Acronym Geek. February 14, 2012, 10:05. Available at: http://www.acronymgeek.com/SPR. Accessed February 14, 2012, 10:05. |