| APA | HTOK. (2012, February 16). In Acronym Geek. Retrieved 07:12, February 16, 2012, from http://www.acronymgeek.com/HTOK |
| MLA | "HTOK." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HTOK>. |
| MHRA | 'HTOK', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HTOK> [accessed 16 February 2012] |
| Chicago | "HTOK", http://www.acronymgeek.com/HTOK (accessed February 16, 2012). |
| CBE/CSE | HTOK [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HTOK. |
| Bluebook | HTOK, http://www.acronymgeek.com/HTOK (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HTOK, http://www.acronymgeek.com/HTOK (optional description here) (as of Feb. 16, 2012, 07:12). |
| AMA | HTOK. Acronym Geek. February 16, 2012, 07:12. Available at: http://www.acronymgeek.com/HTOK. Accessed February 16, 2012, 07:12. |