| APA | PHOA. (2012, February 15). In Acronym Geek. Retrieved 02:24, February 15, 2012, from http://www.acronymgeek.com/PHOA |
| MLA | "PHOA." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/PHOA>. |
| MHRA | 'PHOA', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/PHOA> [accessed 15 February 2012] |
| Chicago | "PHOA", http://www.acronymgeek.com/PHOA (accessed February 15, 2012). |
| CBE/CSE | PHOA [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/PHOA. |
| Bluebook | PHOA, http://www.acronymgeek.com/PHOA (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PHOA, http://www.acronymgeek.com/PHOA (optional description here) (as of Feb. 15, 2012, 02:24). |
| AMA | PHOA. Acronym Geek. February 15, 2012, 02:24. Available at: http://www.acronymgeek.com/PHOA. Accessed February 15, 2012, 02:24. |