His book Among Orangutans: Red Apes and the Rise of Human Culture (Harvard University Press, 2004) gives a more detailed treatment of the ideas covered in this article.

• 他的书《在红毛猩猩之中：红毛猩猩与人类文化的兴起》（哈佛大学出版社，2004年）对本文铺陈的论点有更为详细的讨论。