| APA | PFE. (2012, February 14). In Acronym Geek. Retrieved 19:15, February 14, 2012, from http://www.acronymgeek.com/PFE |
| MLA | "PFE." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/PFE>. |
| MHRA | 'PFE', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/PFE> [accessed 14 February 2012] |
| Chicago | "PFE", http://www.acronymgeek.com/PFE (accessed February 14, 2012). |
| CBE/CSE | PFE [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/PFE. |
| Bluebook | PFE, http://www.acronymgeek.com/PFE (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PFE, http://www.acronymgeek.com/PFE (optional description here) (as of Feb. 14, 2012, 19:15). |
| AMA | PFE. Acronym Geek. February 14, 2012, 19:15. Available at: http://www.acronymgeek.com/PFE. Accessed February 14, 2012, 19:15. |