one of the sources for my reasearch project is a book entittled Essays in Existentialsm and it is by Sartre himself. This is a great primary source in my quest to understand his philosophy. The first chapter is entitled Humanism in Existentialsim and it deals with man and his choices, that everything he does is a choice, everything he inadverntly does not do, is a choice there is no force outside his choices to guide his life. This is intresting because most people just see Existentialsim in realation to nothingness, that everything we do, think, say, feel, could be nehiliated. Although this is true man still makes choices, even if they in the end amount to nothing.
Source: Essays in Existentialsim by Jean-Paul Sartre