| APA | LETR. (2012, February 16). In Acronym Geek. Retrieved 17:30, February 16, 2012, from http://www.acronymgeek.com/LETR |
| MLA | "LETR." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/LETR>. |
| MHRA | 'LETR', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/LETR> [accessed 16 February 2012] |
| Chicago | "LETR", http://www.acronymgeek.com/LETR (accessed February 16, 2012). |
| CBE/CSE | LETR [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/LETR. |
| Bluebook | LETR, http://www.acronymgeek.com/LETR (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, LETR, http://www.acronymgeek.com/LETR (optional description here) (as of Feb. 16, 2012, 17:30). |
| AMA | LETR. Acronym Geek. February 16, 2012, 17:30. Available at: http://www.acronymgeek.com/LETR. Accessed February 16, 2012, 17:30. |