| APA | PHN. (2012, February 9). In Acronym Geek. Retrieved 08:42, February 9, 2012, from http://www.acronymgeek.com/PHN |
| MLA | "PHN." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/PHN>. |
| MHRA | 'PHN', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/PHN> [accessed 9 February 2012] |
| Chicago | "PHN", http://www.acronymgeek.com/PHN (accessed February 9, 2012). |
| CBE/CSE | PHN [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/PHN. |
| Bluebook | PHN, http://www.acronymgeek.com/PHN (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PHN, http://www.acronymgeek.com/PHN (optional description here) (as of Feb. 9, 2012, 08:42). |
| AMA | PHN. Acronym Geek. February 9, 2012, 08:42. Available at: http://www.acronymgeek.com/PHN. Accessed February 9, 2012, 08:42. |