This source is written by a student which makes it easy to understand and is usefull as it shows how the novella The Metamorphosis, by Kafka, relates to existentialism and gives examples.

This source includes a biography of Franz Kafka and explains how he can be related to existentialism. It mostly, however, talks about Kafka's work.

This source describes what aetheistic existentialism is and also introduces Frederich Nietzsche and Jean-Paul Sartre and explains how they are related to the theory. The source also provides some work of the two men which might be helpfull for us to know.

This source is usefull for our project as it not only describes what existentialism is, but also explains how Christianity is related to the idea and states the similarities and differences between the two.