| APA | ACK. (2012, February 10). In Acronym Geek. Retrieved 10:49, February 10, 2012, from http://www.acronymgeek.com/ACK |
| MLA | "ACK." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/ACK>. |
| MHRA | 'ACK', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/ACK> [accessed 10 February 2012] |
| Chicago | "ACK", http://www.acronymgeek.com/ACK (accessed February 10, 2012). |
| CBE/CSE | ACK [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/ACK. |
| Bluebook | ACK, http://www.acronymgeek.com/ACK (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, ACK, http://www.acronymgeek.com/ACK (optional description here) (as of Feb. 10, 2012, 10:49). |
| AMA | ACK. Acronym Geek. February 10, 2012, 10:49. Available at: http://www.acronymgeek.com/ACK. Accessed February 10, 2012, 10:49. |