APA
Hawking S., . (2002). On the shoulders of giants. London: Penguin.
Chicago
Hawking Stephen, . 2002. On the shoulders of giants. London: Penguin.
Harvard
Hawking S., . (2002). On the shoulders of giants. London: Penguin.
MLA
Hawking Stephen, . On the shoulders of giants. London: Penguin. 2002.