Your Works Cited should:
If you are citing a source from any of the following databases...
look for a "cite" button like this...
and then copy the MLA citation from the list of options.
Jones, Charlotte Foltz. Mistakes That Worked: the World's Familiar Inventions and How They Came to Be.
Delacorte Press, 2016., 10-12.
Ament, Phil. "Duct Tape History." The Great Idea Finder, 2007,
Patent (example is for a Band-Aid):
Dickson, Earle. "Surgical Dressing." Patent 1,612,267. 29 December 1925.