| APA | COL.. (2012, February 9). In Acronym Geek. Retrieved 20:18, February 9, 2012, from http://www.acronymgeek.com/COL. |
| MLA | "COL.." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/COL.>. |
| MHRA | 'COL.', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/COL.> [accessed 9 February 2012] |
| Chicago | "COL.", http://www.acronymgeek.com/COL. (accessed February 9, 2012). |
| CBE/CSE | COL. [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/COL.. |
| Bluebook | COL., http://www.acronymgeek.com/COL. (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, COL., http://www.acronymgeek.com/COL. (optional description here) (as of Feb. 9, 2012, 20:18). |
| AMA | COL.. Acronym Geek. February 9, 2012, 20:18. Available at: http://www.acronymgeek.com/COL.. Accessed February 9, 2012, 20:18. |