| APA | SMTP. (2012, February 9). In Acronym Geek. Retrieved 20:18, February 9, 2012, from http://www.acronymgeek.com/SMTP |
| MLA | "SMTP." Acronym Geek. (2012). Acronym Geek. 9 Feb 2012 <http://www.acronymgeek.com/SMTP>. |
| MHRA | 'SMTP', Acronym Geek, 9 February 2012, <http://www.acronymgeek.com/SMTP> [accessed 9 February 2012] |
| Chicago | "SMTP", http://www.acronymgeek.com/SMTP (accessed February 9, 2012). |
| CBE/CSE | SMTP [Internet]. Acronym Geek; 2012 Feb 9 [cited 2012 Feb 9]. Available from: http://www.acronymgeek.com/SMTP. |
| Bluebook | SMTP, http://www.acronymgeek.com/SMTP (last visited February 9, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, SMTP, http://www.acronymgeek.com/SMTP (optional description here) (as of Feb. 9, 2012, 20:18). |
| AMA | SMTP. Acronym Geek. February 9, 2012, 20:18. Available at: http://www.acronymgeek.com/SMTP. Accessed February 9, 2012, 20:18. |