The Land Down Under. Australia Department of Tourism, 1 February 2013. Web. 14 June 2013.
According to the list of options, the last one is correct. When information is unavailable when creating a citation, just leave it out. If you put N.A. in its place the reader might think the author is listed as N.A. since some authors only use initials in their work (A.A. Milne...). The information is the title of the source followed by the publishing organization. Next is the date of creation followed by the access date.
Please note: this question is out of date. The new MLA guidelines would cite this source now as:
The Land Down Under. Australia Department of Tourism, 1 February 2013. Accessed 14 June 2013. The URL would be included after the date of creation. The word Web is no longer required.
