| APA | PGAO. (2012, February 16). In Acronym Geek. Retrieved 16:18, February 16, 2012, from http://www.acronymgeek.com/PGAO |
| MLA | "PGAO." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/PGAO>. |
| MHRA | 'PGAO', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/PGAO> [accessed 16 February 2012] |
| Chicago | "PGAO", http://www.acronymgeek.com/PGAO (accessed February 16, 2012). |
| CBE/CSE | PGAO [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/PGAO. |
| Bluebook | PGAO, http://www.acronymgeek.com/PGAO (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PGAO, http://www.acronymgeek.com/PGAO (optional description here) (as of Feb. 16, 2012, 16:18). |
| AMA | PGAO. Acronym Geek. February 16, 2012, 16:18. Available at: http://www.acronymgeek.com/PGAO. Accessed February 16, 2012, 16:18. |