| APA | 4APY. (2012, February 10). In Acronym Geek. Retrieved 09:46, February 10, 2012, from http://www.acronymgeek.com/4APY |
| MLA | "4APY." Acronym Geek. (2012). Acronym Geek. 10 Feb 2012 <http://www.acronymgeek.com/4APY>. |
| MHRA | '4APY', Acronym Geek, 10 February 2012, <http://www.acronymgeek.com/4APY> [accessed 10 February 2012] |
| Chicago | "4APY", http://www.acronymgeek.com/4APY (accessed February 10, 2012). |
| CBE/CSE | 4APY [Internet]. Acronym Geek; 2012 Feb 10 [cited 2012 Feb 10]. Available from: http://www.acronymgeek.com/4APY. |
| Bluebook | 4APY, http://www.acronymgeek.com/4APY (last visited February 10, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, 4APY, http://www.acronymgeek.com/4APY (optional description here) (as of Feb. 10, 2012, 09:46). |
| AMA | 4APY. Acronym Geek. February 10, 2012, 09:46. Available at: http://www.acronymgeek.com/4APY. Accessed February 10, 2012, 09:46. |