| APA | PTFS. (2012, February 15). In Acronym Geek. Retrieved 05:29, February 15, 2012, from http://www.acronymgeek.com/PTFS |
| MLA | "PTFS." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/PTFS>. |
| MHRA | 'PTFS', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/PTFS> [accessed 15 February 2012] |
| Chicago | "PTFS", http://www.acronymgeek.com/PTFS (accessed February 15, 2012). |
| CBE/CSE | PTFS [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/PTFS. |
| Bluebook | PTFS, http://www.acronymgeek.com/PTFS (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTFS, http://www.acronymgeek.com/PTFS (optional description here) (as of Feb. 15, 2012, 05:29). |
| AMA | PTFS. Acronym Geek. February 15, 2012, 05:29. Available at: http://www.acronymgeek.com/PTFS. Accessed February 15, 2012, 05:29. |