What has the author Charles A Garfield written?

There seems to be a mistake. There is no known author named "Charles A. Garfield" with significant literary works.

It is possible you are thinking of:

* James Garfield: The 20th president of the United States. He did not write any notable books.

* Charles A. Garfield, an American inventor and businessman: He is known for his work on the "Garfield System" of business training, but he is not known as a writer.

If you can provide more context or clarify the name, I might be able to help you find the author you're looking for.