| APA | Humanitarian Assistance Operations (HAO). (2012, February 14). In Acronym Geek. Retrieved 01:44, February 14, 2012, from http://www.acronymgeek.com/HAO/Humanitarian_Assistance_Operations |
| MLA | "Humanitarian Assistance Operations (HAO)." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/HAO/Humanitarian_Assistance_Operations>. |
| MHRA | 'Humanitarian Assistance Operations (HAO)', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/HAO/Humanitarian_Assistance_Operations> [accessed 14 February 2012] |
| Chicago | "Humanitarian Assistance Operations (HAO)", http://www.acronymgeek.com/HAO/Humanitarian_Assistance_Operations (accessed February 14, 2012). |
| CBE/CSE | Humanitarian Assistance Operations (HAO) [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/HAO/Humanitarian_Assistance_Operations. |
| Bluebook | Humanitarian Assistance Operations (HAO), http://www.acronymgeek.com/HAO/Humanitarian_Assistance_Operations (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, Humanitarian Assistance Operations (HAO), http://www.acronymgeek.com/HAO/Humanitarian_Assistance_Operations (optional description here) (as of Feb. 14, 2012, 01:44). |
| AMA | Humanitarian Assistance Operations (HAO). Acronym Geek. February 14, 2012, 01:44. Available at: http://www.acronymgeek.com/HAO/Humanitarian_Assistance_Operations. Accessed February 14, 2012, 01:44. |