| APA | 4BSD. (2012, February 15). In Acronym Geek. Retrieved 22:19, February 15, 2012, from http://www.acronymgeek.com/4BSD |
| MLA | "4BSD." Acronym Geek. (2012). Acronym Geek. 15 Feb 2012 <http://www.acronymgeek.com/4BSD>. |
| MHRA | '4BSD', Acronym Geek, 15 February 2012, <http://www.acronymgeek.com/4BSD> [accessed 15 February 2012] |
| Chicago | "4BSD", http://www.acronymgeek.com/4BSD (accessed February 15, 2012). |
| CBE/CSE | 4BSD [Internet]. Acronym Geek; 2012 Feb 15 [cited 2012 Feb 15]. Available from: http://www.acronymgeek.com/4BSD. |
| Bluebook | 4BSD, http://www.acronymgeek.com/4BSD (last visited February 15, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, 4BSD, http://www.acronymgeek.com/4BSD (optional description here) (as of Feb. 15, 2012, 22:19). |
| AMA | 4BSD. Acronym Geek. February 15, 2012, 22:19. Available at: http://www.acronymgeek.com/4BSD. Accessed February 15, 2012, 22:19. |