| APA | H.H.. (2012, February 11). In Acronym Geek. Retrieved 21:30, February 11, 2012, from http://www.acronymgeek.com/H.H. |
| MLA | "H.H.." Acronym Geek. (2012). Acronym Geek. 11 Feb 2012 <http://www.acronymgeek.com/H.H.>. |
| MHRA | 'H.H.', Acronym Geek, 11 February 2012, <http://www.acronymgeek.com/H.H.> [accessed 11 February 2012] |
| Chicago | "H.H.", http://www.acronymgeek.com/H.H. (accessed February 11, 2012). |
| CBE/CSE | H.H. [Internet]. Acronym Geek; 2012 Feb 11 [cited 2012 Feb 11]. Available from: http://www.acronymgeek.com/H.H.. |
| Bluebook | H.H., http://www.acronymgeek.com/H.H. (last visited February 11, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, H.H., http://www.acronymgeek.com/H.H. (optional description here) (as of Feb. 11, 2012, 21:30). |
| AMA | H.H.. Acronym Geek. February 11, 2012, 21:30. Available at: http://www.acronymgeek.com/H.H.. Accessed February 11, 2012, 21:30. |