Gaya APA

Bono, E, D. (1978). Practical thinking: 4 Ways to right, 5 ways to be wrong, 5 ways to understand. . Harmondsworth: Harmondsworth Penguin Books.

Gaya MLA

Bono, Edward, De. "Practical thinking: 4 Ways to right, 5 ways to be wrong, 5 ways to understand. ". Harmondsworth: Harmondsworth Penguin Books, 1978. Buku.