| APA | APU. (2012, February 14). In Acronym Geek. Retrieved 09:18, February 14, 2012, from http://www.acronymgeek.com/APU |
| MLA | "APU." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/APU>. |
| MHRA | 'APU', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/APU> [accessed 14 February 2012] |
| Chicago | "APU", http://www.acronymgeek.com/APU (accessed February 14, 2012). |
| CBE/CSE | APU [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/APU. |
| Bluebook | APU, http://www.acronymgeek.com/APU (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, APU, http://www.acronymgeek.com/APU (optional description here) (as of Feb. 14, 2012, 09:18). |
| AMA | APU. Acronym Geek. February 14, 2012, 09:18. Available at: http://www.acronymgeek.com/APU. Accessed February 14, 2012, 09:18. |