| APA | HOPD. (2012, February 12). In Acronym Geek. Retrieved 07:11, February 12, 2012, from http://www.acronymgeek.com/HOPD |
| MLA | "HOPD." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/HOPD>. |
| MHRA | 'HOPD', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/HOPD> [accessed 12 February 2012] |
| Chicago | "HOPD", http://www.acronymgeek.com/HOPD (accessed February 12, 2012). |
| CBE/CSE | HOPD [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/HOPD. |
| Bluebook | HOPD, http://www.acronymgeek.com/HOPD (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HOPD, http://www.acronymgeek.com/HOPD (optional description here) (as of Feb. 12, 2012, 07:11). |
| AMA | HOPD. Acronym Geek. February 12, 2012, 07:11. Available at: http://www.acronymgeek.com/HOPD. Accessed February 12, 2012, 07:11. |