| APA | SYPN. (2012, February 17). In Acronym Geek. Retrieved 05:49, February 17, 2012, from http://www.acronymgeek.com/SYPN |
| MLA | "SYPN." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/SYPN>. |
| MHRA | 'SYPN', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/SYPN> [accessed 17 February 2012] |
| Chicago | "SYPN", http://www.acronymgeek.com/SYPN (accessed February 17, 2012). |
| CBE/CSE | SYPN [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/SYPN. |
| Bluebook | SYPN, http://www.acronymgeek.com/SYPN (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SYPN, http://www.acronymgeek.com/SYPN (optional description here) (as of Feb. 17, 2012, 05:49). |
| AMA | SYPN. Acronym Geek. February 17, 2012, 05:49. Available at: http://www.acronymgeek.com/SYPN. Accessed February 17, 2012, 05:49. |