| APA | PTFO. (2012, February 17). In Acronym Geek. Retrieved 00:39, February 17, 2012, from http://www.acronymgeek.com/PTFO |
| MLA | "PTFO." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/PTFO>. |
| MHRA | 'PTFO', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/PTFO> [accessed 17 February 2012] |
| Chicago | "PTFO", http://www.acronymgeek.com/PTFO (accessed February 17, 2012). |
| CBE/CSE | PTFO [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/PTFO. |
| Bluebook | PTFO, http://www.acronymgeek.com/PTFO (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PTFO, http://www.acronymgeek.com/PTFO (optional description here) (as of Feb. 17, 2012, 00:39). |
| AMA | PTFO. Acronym Geek. February 17, 2012, 00:39. Available at: http://www.acronymgeek.com/PTFO. Accessed February 17, 2012, 00:39. |