| APA | PPG. (2012, February 4). In Acronym Geek. Retrieved 11:28, February 4, 2012, from http://www.acronymgeek.com/PPG |
| MLA | "PPG." Acronym Geek. (2012). Acronym Geek. 4 Feb 2012 <http://www.acronymgeek.com/PPG>. |
| MHRA | 'PPG', Acronym Geek, 4 February 2012, <http://www.acronymgeek.com/PPG> [accessed 4 February 2012] |
| Chicago | "PPG", http://www.acronymgeek.com/PPG (accessed February 4, 2012). |
| CBE/CSE | PPG [Internet]. Acronym Geek; 2012 Feb 4 [cited 2012 Feb 4]. Available from: http://www.acronymgeek.com/PPG. |
| Bluebook | PPG, http://www.acronymgeek.com/PPG (last visited February 4, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PPG, http://www.acronymgeek.com/PPG (optional description here) (as of Feb. 4, 2012, 11:28). |
| AMA | PPG. Acronym Geek. February 4, 2012, 11:28. Available at: http://www.acronymgeek.com/PPG. Accessed February 4, 2012, 11:28. |