Existentialism Bibliography

Existentialism: From Dostoevsky to Sartre, by Walter Kaufmann. An Introduction to Existentialism, by Robert G. Olson.
Socrates to Sartre: A History of Philosophy, by Samuel Enoch Stumpf.
Biographical Dictionary of the Twentieth-Century Philosophers, edited by Stuart Brown, et al.
The Encyclopedia of Philosophy, edited by Paul Edwards, et al.
The Cambridge Dictionary of Philosophy, edited by Robert Audi, et al.
101 Key Ideas: Existentialism, by George Myerson.
Sartre, by Neil Levy.