(pages 648-649, 678, and 692 on sex ratio)*Richard Dawkins (2004) "The Seal's Tale", "The Ancestor's Tale", A Pilgrimage to the Dawn of Life.
(pages 648—649, 678, 692)* "Richard Dawkins" (2004) «The Seal’s Tale», The Ancestor’s Tale, A Pilgrimage to the Dawn of Life.