| APA | H2D. (2012, February 14). In Acronym Geek. Retrieved 07:11, February 14, 2012, from http://www.acronymgeek.com/H2D |
| MLA | "H2D." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/H2D>. |
| MHRA | 'H2D', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/H2D> [accessed 14 February 2012] |
| Chicago | "H2D", http://www.acronymgeek.com/H2D (accessed February 14, 2012). |
| CBE/CSE | H2D [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/H2D. |
| Bluebook | H2D, http://www.acronymgeek.com/H2D (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, H2D, http://www.acronymgeek.com/H2D (optional description here) (as of Feb. 14, 2012, 07:11). |
| AMA | H2D. Acronym Geek. February 14, 2012, 07:11. Available at: http://www.acronymgeek.com/H2D. Accessed February 14, 2012, 07:11. |