APA
Beauvoir S. d., Timmerman M., . (2020). What is existentialism?. London: Penguin Books.
Chicago
Beauvoir Simone de, Timmerman Marybeth, . 2020. What is existentialism?. London: Penguin Books.
Harvard
Beauvoir S. d., Timmerman M., . (2020). What is existentialism?. London: Penguin Books.
MLA
Beauvoir Simone de, Timmerman Marybeth, . What is existentialism?. London: Penguin Books. 2020.