Dawkins, R. (1986). The blind watchmaker. New York: Penguin books.
Dyfyniad Arddull ChicagoDawkins, Richard. The Blind Watchmaker. New York: Penguin books, 1986.
Dyfyniad MLADawkins, Richard. The Blind Watchmaker. New York: Penguin books, 1986.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.