| APA | ACU. (2012, February 14). In Acronym Geek. Retrieved 02:19, February 14, 2012, from http://www.acronymgeek.com/ACU |
| MLA | "ACU." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/ACU>. |
| MHRA | 'ACU', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/ACU> [accessed 14 February 2012] |
| Chicago | "ACU", http://www.acronymgeek.com/ACU (accessed February 14, 2012). |
| CBE/CSE | ACU [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/ACU. |
| Bluebook | ACU, http://www.acronymgeek.com/ACU (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ACU, http://www.acronymgeek.com/ACU (optional description here) (as of Feb. 14, 2012, 02:19). |
| AMA | ACU. Acronym Geek. February 14, 2012, 02:19. Available at: http://www.acronymgeek.com/ACU. Accessed February 14, 2012, 02:19. |