| APA | TPI. (2012, February 9). In Acronym Geek. Retrieved 20:29, February 9, 2012, from http://www.acronymgeek.com/TPI |
| MLA | "TPI." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/TPI>. |
| MHRA | 'TPI', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/TPI> [accessed 9 February 2012] |
| Chicago | "TPI", http://www.acronymgeek.com/TPI (accessed February 9, 2012). |
| CBE/CSE | TPI [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/TPI. |
| Bluebook | TPI, http://www.acronymgeek.com/TPI (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, TPI, http://www.acronymgeek.com/TPI (optional description here) (as of Feb. 9, 2012, 20:29). |
| AMA | TPI. Acronym Geek. February 9, 2012, 20:29. Available at: http://www.acronymgeek.com/TPI. Accessed February 9, 2012, 20:29. |