| APA | HOL. (2012, February 14). In Acronym Geek. Retrieved 04:26, February 14, 2012, from http://www.acronymgeek.com/HOL |
| MLA | "HOL." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HOL>. |
| MHRA | 'HOL', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HOL> [accessed 14 February 2012] |
| Chicago | "HOL", http://www.acronymgeek.com/HOL (accessed February 14, 2012). |
| CBE/CSE | HOL [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HOL. |
| Bluebook | HOL, http://www.acronymgeek.com/HOL (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HOL, http://www.acronymgeek.com/HOL (optional description here) (as of Feb. 14, 2012, 04:26). |
| AMA | HOL. Acronym Geek. February 14, 2012, 04:26. Available at: http://www.acronymgeek.com/HOL. Accessed February 14, 2012, 04:26. |