| APA | SPTD. (2012, February 17). In Acronym Geek. Retrieved 01:37, February 17, 2012, from http://www.acronymgeek.com/SPTD |
| MLA | "SPTD." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/SPTD>. |
| MHRA | 'SPTD', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/SPTD> [accessed 17 February 2012] |
| Chicago | "SPTD", http://www.acronymgeek.com/SPTD (accessed February 17, 2012). |
| CBE/CSE | SPTD [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/SPTD. |
| Bluebook | SPTD, http://www.acronymgeek.com/SPTD (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SPTD, http://www.acronymgeek.com/SPTD (optional description here) (as of Feb. 17, 2012, 01:37). |
| AMA | SPTD. Acronym Geek. February 17, 2012, 01:37. Available at: http://www.acronymgeek.com/SPTD. Accessed February 17, 2012, 01:37. |