| APA | GYPI. (2012, February 14). In Acronym Geek. Retrieved 16:40, February 14, 2012, from http://www.acronymgeek.com/GYPI |
| MLA | "GYPI." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/GYPI>. |
| MHRA | 'GYPI', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/GYPI> [accessed 14 February 2012] |
| Chicago | "GYPI", http://www.acronymgeek.com/GYPI (accessed February 14, 2012). |
| CBE/CSE | GYPI [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/GYPI. |
| Bluebook | GYPI, http://www.acronymgeek.com/GYPI (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GYPI, http://www.acronymgeek.com/GYPI (optional description here) (as of Feb. 14, 2012, 16:40). |
| AMA | GYPI. Acronym Geek. February 14, 2012, 16:40. Available at: http://www.acronymgeek.com/GYPI. Accessed February 14, 2012, 16:40. |