| APA | GUM. (2012, February 14). In Acronym Geek. Retrieved 19:22, February 14, 2012, from http://www.acronymgeek.com/GUM |
| MLA | "GUM." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/GUM>. |
| MHRA | 'GUM', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/GUM> [accessed 14 February 2012] |
| Chicago | "GUM", http://www.acronymgeek.com/GUM (accessed February 14, 2012). |
| CBE/CSE | GUM [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/GUM. |
| Bluebook | GUM, http://www.acronymgeek.com/GUM (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GUM, http://www.acronymgeek.com/GUM (optional description here) (as of Feb. 14, 2012, 19:22). |
| AMA | GUM. Acronym Geek. February 14, 2012, 19:22. Available at: http://www.acronymgeek.com/GUM. Accessed February 14, 2012, 19:22. |