| APA | GFDO. (2012, February 10). In Acronym Geek. Retrieved 08:38, February 10, 2012, from http://www.acronymgeek.com/GFDO |
| MLA | "GFDO." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/GFDO>. |
| MHRA | 'GFDO', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/GFDO> [accessed 10 February 2012] |
| Chicago | "GFDO", http://www.acronymgeek.com/GFDO (accessed February 10, 2012). |
| CBE/CSE | GFDO [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/GFDO. |
| Bluebook | GFDO, http://www.acronymgeek.com/GFDO (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GFDO, http://www.acronymgeek.com/GFDO (optional description here) (as of Feb. 10, 2012, 08:38). |
| AMA | GFDO. Acronym Geek. February 10, 2012, 08:38. Available at: http://www.acronymgeek.com/GFDO. Accessed February 10, 2012, 08:38. |