* {{cite book |last=Dawkins |first=Richard |title=The Selfish Gene |edition=2nd |year=1989 |publisher=Oxford University Press |location=United Kingdom |isbn=978-0-19-286092-7 |title-link=The Selfish Gene }} | * {{cite book |last=Dawkins |first=Richard |title=The Selfish Gene |edition=2nd |year=1989 |publisher=Oxford University Press |location=United Kingdom |isbn=978-0-19-286092-7 |title-link=The Selfish Gene }} |