| APA | PGOI. (2012, February 14). In Acronym Geek. Retrieved 15:45, February 14, 2012, from http://www.acronymgeek.com/PGOI |
| MLA | "PGOI." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PGOI>. |
| MHRA | 'PGOI', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PGOI> [accessed 14 February 2012] |
| Chicago | "PGOI", http://www.acronymgeek.com/PGOI (accessed February 14, 2012). |
| CBE/CSE | PGOI [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PGOI. |
| Bluebook | PGOI, http://www.acronymgeek.com/PGOI (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PGOI, http://www.acronymgeek.com/PGOI (optional description here) (as of Feb. 14, 2012, 15:45). |
| AMA | PGOI. Acronym Geek. February 14, 2012, 15:45. Available at: http://www.acronymgeek.com/PGOI. Accessed February 14, 2012, 15:45. |