| APA | GCM. (2012, February 9). In Acronym Geek. Retrieved 20:52, February 9, 2012, from http://www.acronymgeek.com/GCM |
| MLA | "GCM." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/GCM>. |
| MHRA | 'GCM', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/GCM> [accessed 9 February 2012] |
| Chicago | "GCM", http://www.acronymgeek.com/GCM (accessed February 9, 2012). |
| CBE/CSE | GCM [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/GCM. |
| Bluebook | GCM, http://www.acronymgeek.com/GCM (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GCM, http://www.acronymgeek.com/GCM (optional description here) (as of Feb. 9, 2012, 20:52). |
| AMA | GCM. Acronym Geek. February 9, 2012, 20:52. Available at: http://www.acronymgeek.com/GCM. Accessed February 9, 2012, 20:52. |