I have just discovered that the South Dakota has an online database for 100 year and older birth records. The citation I have come up with is;
South Dakota Department of Health, Online Services (http://doh.sd.gov/OnlineServices.aspx : accessed 11 April 2012), Search 100 year-old birth records, entry for Harvey Holzer, 27 December 1895, state file no. 782293
My questions are whether to use the home page web address or the one I chose for the online services. Do I need to make a note that "Search 100 year-old birth records" is a link? I added the full birth date and the state file no. as they are searchable items from the search page.