Cita APA (7th ed.)

Hawking, S. (2018). Brief answers to the big questions (First U.S. edition.). Bantam Books.

Cita Chicago (17th ed.)

Hawking, Stephen. Brief Answers to the Big Questions. First U.S. edition. New York: Bantam Books, 2018.

Cita MLA (9th ed.)

Hawking, Stephen. Brief Answers to the Big Questions. First U.S. edition. Bantam Books, 2018.