| APA | PHDL. (2012, February 15). In Acronym Geek. Retrieved 04:33, February 15, 2012, from http://www.acronymgeek.com/PHDL |
| MLA | "PHDL." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/PHDL>. |
| MHRA | 'PHDL', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/PHDL> [accessed 15 February 2012] |
| Chicago | "PHDL", http://www.acronymgeek.com/PHDL (accessed February 15, 2012). |
| CBE/CSE | PHDL [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/PHDL. |
| Bluebook | PHDL, http://www.acronymgeek.com/PHDL (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PHDL, http://www.acronymgeek.com/PHDL (optional description here) (as of Feb. 15, 2012, 04:33). |
| AMA | PHDL. Acronym Geek. February 15, 2012, 04:33. Available at: http://www.acronymgeek.com/PHDL. Accessed February 15, 2012, 04:33. |