MLA

Watts, Alan. The Way of Zen. 5th repr. Harmondsworth: Penguin books, 1972.

APA

Watts, A. (1972). The way of Zen. 5th repr. Harmondsworth: Penguin books.

Chicago

Watts, Alan, The Way of Zen. 5th repr. Harmondsworth: Penguin books, 1972.