| APA | SPNL. (2012, February 16). In Acronym Geek. Retrieved 14:46, February 16, 2012, from http://www.acronymgeek.com/SPNL |
| MLA | "SPNL." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/SPNL>. |
| MHRA | 'SPNL', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/SPNL> [accessed 16 February 2012] |
| Chicago | "SPNL", http://www.acronymgeek.com/SPNL (accessed February 16, 2012). |
| CBE/CSE | SPNL [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/SPNL. |
| Bluebook | SPNL, http://www.acronymgeek.com/SPNL (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SPNL, http://www.acronymgeek.com/SPNL (optional description here) (as of Feb. 16, 2012, 14:46). |
| AMA | SPNL. Acronym Geek. February 16, 2012, 14:46. Available at: http://www.acronymgeek.com/SPNL. Accessed February 16, 2012, 14:46. |