| APA | GYDN. (2012, February 16). In Acronym Geek. Retrieved 16:15, February 16, 2012, from http://www.acronymgeek.com/GYDN |
| MLA | "GYDN." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/GYDN>. |
| MHRA | 'GYDN', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/GYDN> [accessed 16 February 2012] |
| Chicago | "GYDN", http://www.acronymgeek.com/GYDN (accessed February 16, 2012). |
| CBE/CSE | GYDN [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/GYDN. |
| Bluebook | GYDN, http://www.acronymgeek.com/GYDN (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GYDN, http://www.acronymgeek.com/GYDN (optional description here) (as of Feb. 16, 2012, 16:15). |
| AMA | GYDN. Acronym Geek. February 16, 2012, 16:15. Available at: http://www.acronymgeek.com/GYDN. Accessed February 16, 2012, 16:15. |