[en] [Gutenberg 63540] • Evolution and Adaptation New York, London, The Macmillan Company
[en] The Third Chimpanzee for Young People Triangle Square
[en] Summer World · a Season of Bounty HarperCollins
[en] Survival of the Sickest · A Medical Maverick Discovers Why We Need Disease William Morrow
[en] Passport to the Cosmos White Crow Books