| APA | HEAF. (2012, February 16). In Acronym Geek. Retrieved 05:00, February 16, 2012, from http://www.acronymgeek.com/HEAF |
| MLA | "HEAF." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/HEAF>. |
| MHRA | 'HEAF', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/HEAF> [accessed 16 February 2012] |
| Chicago | "HEAF", http://www.acronymgeek.com/HEAF (accessed February 16, 2012). |
| CBE/CSE | HEAF [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/HEAF. |
| Bluebook | HEAF, http://www.acronymgeek.com/HEAF (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, HEAF, http://www.acronymgeek.com/HEAF (optional description here) (as of Feb. 16, 2012, 05:00). |
| AMA | HEAF. Acronym Geek. February 16, 2012, 05:00. Available at: http://www.acronymgeek.com/HEAF. Accessed February 16, 2012, 05:00. |