| APA | H2O. (2012, February 13). In Acronym Geek. Retrieved 23:52, February 13, 2012, from http://www.acronymgeek.com/H2O |
| MLA | "H2O." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/H2O>. |
| MHRA | 'H2O', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/H2O> [accessed 13 February 2012] |
| Chicago | "H2O", http://www.acronymgeek.com/H2O (accessed February 13, 2012). |
| CBE/CSE | H2O [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/H2O. |
| Bluebook | H2O, http://www.acronymgeek.com/H2O (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, H2O, http://www.acronymgeek.com/H2O (optional description here) (as of Feb. 13, 2012, 23:52). |
| AMA | H2O. Acronym Geek. February 13, 2012, 23:52. Available at: http://www.acronymgeek.com/H2O. Accessed February 13, 2012, 23:52. |