James Rachels wrote six books and edited seven others. The links below provide information about all the books he wrote, as well as two he edited.
These three books can be downloaded for free:  The End of Life: Euthanasia and Morality (1986)
James Rachels' second book of collected essays:  The Legacy of Socrates: Essays in Moral Philosophy (edited by Stuart Rachels) (2007)
James Rachels' textbooks:  The Elements of Moral Philosophy (6th ed. by Stuart Rachels, 2010) An introduction to ethics.
Calling these books "textbooks" does them a disservice. They are not dry and didactic. They do not contain study questions. Jim believed that textbooks should not look and feel like textbooks.
The anthologies below go with The Elements of Moral Philosophy and Problems from Philosophy, respectively:  The Right Thing to Do: Basic Readings in Moral Philosophy (5th ed. by Stuart Rachels, 2010)