| APA | GREG. (2012, February 17). In Acronym Geek. Retrieved 00:59, February 17, 2012, from http://www.acronymgeek.com/GREG |
| MLA | "GREG." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/GREG>. |
| MHRA | 'GREG', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/GREG> [accessed 17 February 2012] |
| Chicago | "GREG", http://www.acronymgeek.com/GREG (accessed February 17, 2012). |
| CBE/CSE | GREG [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/GREG. |
| Bluebook | GREG, http://www.acronymgeek.com/GREG (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GREG, http://www.acronymgeek.com/GREG (optional description here) (as of Feb. 17, 2012, 00:59). |
| AMA | GREG. Acronym Geek. February 17, 2012, 00:59. Available at: http://www.acronymgeek.com/GREG. Accessed February 17, 2012, 00:59. |