| APA | SPRO. (2012, February 16). In Acronym Geek. Retrieved 07:58, February 16, 2012, from http://www.acronymgeek.com/SPRO |
| MLA | "SPRO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/SPRO>. |
| MHRA | 'SPRO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/SPRO> [accessed 16 February 2012] |
| Chicago | "SPRO", http://www.acronymgeek.com/SPRO (accessed February 16, 2012). |
| CBE/CSE | SPRO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/SPRO. |
| Bluebook | SPRO, http://www.acronymgeek.com/SPRO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SPRO, http://www.acronymgeek.com/SPRO (optional description here) (as of Feb. 16, 2012, 07:58). |
| AMA | SPRO. Acronym Geek. February 16, 2012, 07:58. Available at: http://www.acronymgeek.com/SPRO. Accessed February 16, 2012, 07:58. |