| APA | GPPI. (2012, February 15). In Acronym Geek. Retrieved 20:34, February 15, 2012, from http://www.acronymgeek.com/GPPI |
| MLA | "GPPI." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/GPPI>. |
| MHRA | 'GPPI', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/GPPI> [accessed 15 February 2012] |
| Chicago | "GPPI", http://www.acronymgeek.com/GPPI (accessed February 15, 2012). |
| CBE/CSE | GPPI [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/GPPI. |
| Bluebook | GPPI, http://www.acronymgeek.com/GPPI (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GPPI, http://www.acronymgeek.com/GPPI (optional description here) (as of Feb. 15, 2012, 20:34). |
| AMA | GPPI. Acronym Geek. February 15, 2012, 20:34. Available at: http://www.acronymgeek.com/GPPI. Accessed February 15, 2012, 20:34. |