| APA | HBPOA. (2012, February 12). In Acronym Geek. Retrieved 16:48, February 12, 2012, from http://www.acronymgeek.com/HBPOA |
| MLA | "HBPOA." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/HBPOA>. |
| MHRA | 'HBPOA', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/HBPOA> [accessed 12 February 2012] |
| Chicago | "HBPOA", http://www.acronymgeek.com/HBPOA (accessed February 12, 2012). |
| CBE/CSE | HBPOA [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/HBPOA. |
| Bluebook | HBPOA, http://www.acronymgeek.com/HBPOA (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HBPOA, http://www.acronymgeek.com/HBPOA (optional description here) (as of Feb. 12, 2012, 16:48). |
| AMA | HBPOA. Acronym Geek. February 12, 2012, 16:48. Available at: http://www.acronymgeek.com/HBPOA. Accessed February 12, 2012, 16:48. |