| APA | QLEN. (2012, February 16). In Acronym Geek. Retrieved 06:40, February 16, 2012, from http://www.acronymgeek.com/QLEN |
| MLA | "QLEN." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/QLEN>. |
| MHRA | 'QLEN', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/QLEN> [accessed 16 February 2012] |
| Chicago | "QLEN", http://www.acronymgeek.com/QLEN (accessed February 16, 2012). |
| CBE/CSE | QLEN [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/QLEN. |
| Bluebook | QLEN, http://www.acronymgeek.com/QLEN (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, QLEN, http://www.acronymgeek.com/QLEN (optional description here) (as of Feb. 16, 2012, 06:40). |
| AMA | QLEN. Acronym Geek. February 16, 2012, 06:40. Available at: http://www.acronymgeek.com/QLEN. Accessed February 16, 2012, 06:40. |