| APA | GPQO. (2012, February 15). In Acronym Geek. Retrieved 01:49, February 15, 2012, from http://www.acronymgeek.com/GPQO |
| MLA | "GPQO." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/GPQO>. |
| MHRA | 'GPQO', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/GPQO> [accessed 15 February 2012] |
| Chicago | "GPQO", http://www.acronymgeek.com/GPQO (accessed February 15, 2012). |
| CBE/CSE | GPQO [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/GPQO. |
| Bluebook | GPQO, http://www.acronymgeek.com/GPQO (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, GPQO, http://www.acronymgeek.com/GPQO (optional description here) (as of Feb. 15, 2012, 01:49). |
| AMA | GPQO. Acronym Geek. February 15, 2012, 01:49. Available at: http://www.acronymgeek.com/GPQO. Accessed February 15, 2012, 01:49. |