| APA | PORTEL. (2012, February 12). In Acronym Geek. Retrieved 08:43, February 12, 2012, from http://www.acronymgeek.com/PORTEL |
| MLA | "PORTEL." Acronym Geek. (2012). Acronym Geek. 12 Feb 2012 <http://www.acronymgeek.com/PORTEL>. |
| MHRA | 'PORTEL', Acronym Geek, 12 February 2012, <http://www.acronymgeek.com/PORTEL> [accessed 12 February 2012] |
| Chicago | "PORTEL", http://www.acronymgeek.com/PORTEL (accessed February 12, 2012). |
| CBE/CSE | PORTEL [Internet]. Acronym Geek; 2012 Feb 12 [cited 2012 Feb 12]. Available from: http://www.acronymgeek.com/PORTEL. |
| Bluebook | PORTEL, http://www.acronymgeek.com/PORTEL (last visited February 12, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, PORTEL, http://www.acronymgeek.com/PORTEL (optional description here) (as of Feb. 12, 2012, 08:43). |
| AMA | PORTEL. Acronym Geek. February 12, 2012, 08:43. Available at: http://www.acronymgeek.com/PORTEL. Accessed February 12, 2012, 08:43. |