| APA | HOLU. (2012, February 15). In Acronym Geek. Retrieved 11:21, February 15, 2012, from http://www.acronymgeek.com/HOLU |
| MLA | "HOLU." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/HOLU>. |
| MHRA | 'HOLU', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/HOLU> [accessed 15 February 2012] |
| Chicago | "HOLU", http://www.acronymgeek.com/HOLU (accessed February 15, 2012). |
| CBE/CSE | HOLU [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/HOLU. |
| Bluebook | HOLU, http://www.acronymgeek.com/HOLU (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HOLU, http://www.acronymgeek.com/HOLU (optional description here) (as of Feb. 15, 2012, 11:21). |
| AMA | HOLU. Acronym Geek. February 15, 2012, 11:21. Available at: http://www.acronymgeek.com/HOLU. Accessed February 15, 2012, 11:21. |