APA Citatie

Penrose, R., & Roger Penrose; foreword by Martin Gardner. (1991). The: Concerning computers, minds, and the laws of physics. New York, N.Y: Penguin Books.

Chicago Style citaat

Penrose, Roger, en Roger Penrose; foreword by Martin Gardner. The: Concerning Computers, Minds, and the Laws of Physics. New York, N.Y: Penguin Books, 1991.

MLA citatie

Penrose, Roger, en Roger Penrose; foreword by Martin Gardner. The: Concerning Computers, Minds, and the Laws of Physics. New York, N.Y: Penguin Books, 1991.