| APA | TPO. (2012, February 14). In Acronym Geek. Retrieved 07:41, February 14, 2012, from http://www.acronymgeek.com/TPO |
| MLA | "TPO." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/TPO>. |
| MHRA | 'TPO', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/TPO> [accessed 14 February 2012] |
| Chicago | "TPO", http://www.acronymgeek.com/TPO (accessed February 14, 2012). |
| CBE/CSE | TPO [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/TPO. |
| Bluebook | TPO, http://www.acronymgeek.com/TPO (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, TPO, http://www.acronymgeek.com/TPO (optional description here) (as of Feb. 14, 2012, 07:41). |
| AMA | TPO. Acronym Geek. February 14, 2012, 07:41. Available at: http://www.acronymgeek.com/TPO. Accessed February 14, 2012, 07:41. |