In MARQCAT, our online catalog, searching for an author as a subject rather than as an author can make a huge difference.  Here are examples for Antoine de Saint-Exupéry:

A subject search on Saint-Exupéry gives 40+ results.  These are books about him ...

An author search on Saint-Exupéry gives only 25+ results.  These are books by him.

For fun, check out this xkcd comic ... a little black humor on Le Petit Prince ...

Thanks to xkcd!

The FRANTEXT database (formerly the Trésor de la Langue Française) consists of over 2600 texts, ranging from classic works of French literature to various kinds of non-fiction prose and technical writing. The eighteenth, nineteenth and twentieth centuries are about equally represented, with a smaller selection of seventeenth century texts as well as some medieval and Renaissance texts. Genres include novels, poetry, theater, journalism, essays, correspondence, and treatises. Subjects include literary criticism, biology, history, economics, and philosophy. In most cases standard scholarly editions were used in converting the text into machine-readable form, and the data contain page references to these editions.

Find books and other items in libraries near and far.  Most items may be requested through Interlibrary Loan. 

Google Books is a great resource for finding books and gives a preview of what the book is about and often short sections to view.

There is a link to see if your local library library owns the book and you can see if any of the local libraries have the book!