| APA | PGI. (2012, February 13). In Acronym Geek. Retrieved 21:02, February 13, 2012, from http://www.acronymgeek.com/PGI |
| MLA | "PGI." Acronym Geek. (2012). Acronym Geek. 13 Feb 2012 <http://www.acronymgeek.com/PGI>. |
| MHRA | 'PGI', Acronym Geek, 13 February 2012, <http://www.acronymgeek.com/PGI> [accessed 13 February 2012] |
| Chicago | "PGI", http://www.acronymgeek.com/PGI (accessed February 13, 2012). |
| CBE/CSE | PGI [Internet]. Acronym Geek; 2012 Feb 13 [cited 2012 Feb 13]. Available from: http://www.acronymgeek.com/PGI. |
| Bluebook | PGI, http://www.acronymgeek.com/PGI (last visited February 13, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PGI, http://www.acronymgeek.com/PGI (optional description here) (as of Feb. 13, 2012, 21:02). |
| AMA | PGI. Acronym Geek. February 13, 2012, 21:02. Available at: http://www.acronymgeek.com/PGI. Accessed February 13, 2012, 21:02. |