| APA | SPG. (2012, February 13). In Acronym Geek. Retrieved 21:45, February 13, 2012, from http://www.acronymgeek.com/SPG |
| MLA | "SPG." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/SPG>. |
| MHRA | 'SPG', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/SPG> [accessed 13 February 2012] |
| Chicago | "SPG", http://www.acronymgeek.com/SPG (accessed February 13, 2012). |
| CBE/CSE | SPG [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/SPG. |
| Bluebook | SPG, http://www.acronymgeek.com/SPG (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SPG, http://www.acronymgeek.com/SPG (optional description here) (as of Feb. 13, 2012, 21:45). |
| AMA | SPG. Acronym Geek. February 13, 2012, 21:45. Available at: http://www.acronymgeek.com/SPG. Accessed February 13, 2012, 21:45. |