Using the parenthetical / reference list Turabian citation style you correctly identify a source in the text (in-text) of your paper by including key source information next to the reference to that source in parenthesis. You can consult Section 18.3 of the manual for additional information if needed.
See Turabian's A Manual For Writers fugure A.11 in the appendix for a sample page of text with parenthetical citations.
Parenthetical Citation Example Index:
Chapter 19.7
NOTE:
Instead of a parenthetical citaiton, for a web site without a formal publication date you can provide the name of the author, owner of the site, or the decriptive phase used as title in your reference list in your text. Full citation to the exent possible beyond indication of URL should still occur in your reference list.