Cite means to quote or mention something.
- When you write a term paper for Dr. Hards, cite your references.
Sight is something seen, an ability to see, the foreseeable future, or an optical instrument.
- The ship’s passengers soon caught sight of the beautiful island.
- The passengers sighted the island from a mile out.
- Unfortunately, there is no compromise or solution in sight.
- Before target practice, John adjusts the sight on his rifle.
Site refers to a location.
- The natural terrain lends itself to being a good site for a house.