| APA | GREI. (2012, February 17). In Acronym Geek. Retrieved 05:27, February 17, 2012, from http://www.acronymgeek.com/GREI |
| MLA | "GREI." Acronym Geek. (2012). Acronym Geek. 17 Feb 2012 <http://www.acronymgeek.com/GREI>. |
| MHRA | 'GREI', Acronym Geek, 17 February 2012, <http://www.acronymgeek.com/GREI> [accessed 17 February 2012] |
| Chicago | "GREI", http://www.acronymgeek.com/GREI (accessed February 17, 2012). |
| CBE/CSE | GREI [Internet]. Acronym Geek; 2012 Feb 17 [cited 2012 Feb 17]. Available from: http://www.acronymgeek.com/GREI. |
| Bluebook | GREI, http://www.acronymgeek.com/GREI (last visited February 17, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GREI, http://www.acronymgeek.com/GREI (optional description here) (as of Feb. 17, 2012, 05:27). |
| AMA | GREI. Acronym Geek. February 17, 2012, 05:27. Available at: http://www.acronymgeek.com/GREI. Accessed February 17, 2012, 05:27. |