In accordance with the http://cup.columbia.edu/book/978-0-231-13210-7/the-columbia-guide-to-onl... Columbia Guide to Online Style (Columbia University Press) the basic format for citing electronic publications is:

Author's Last Name, First Initial. "Title of Work." _Title_of_Complete_Work_. [protocol and address] [path] (date of message or visit).

Specific Examples

Citing a page on the GrainGenes Webserver
Holland, J. "Coefficients-of-parentage of early and midseason oat cultivars". In _GrainGenes_. /ggpages/oatCoP.html (17 Nov. 2000).

For further information on citing electronic resources, see
this website.