Occasionally you will come across documents that lack basic publication details. In these cases, it is necessary to indicate to your reader that these are not available. A series of abbreviations can be used and are generally accepted for this purpose:
No date: use [n.d.]
No place (sine loco): use [s.l.]
No publisher: use [s.n.]
Not known: use [n.k.]
For web pages it is often necessary to look beyond the page you are referencing to the ‘Home Page’ for the whole site or at a link such as ‘About Us’ from that home page. Dates are often given at the bottom of web pages.
First you should check if the publication has a Corporate Author and if so use this. If there is no corporate author and the author cannot be identified, use Anon. and date of publication.
Example: Anon. (1807) The happy villagers. Dublin: J. Shea.
If there is no date for a source, use the author name and [n.d.].
Example: McCullough, A. [n.d.] Sustainable design within economic restrictions. London: Bryn Press.