De Beer, G. (1951). Vertebrate zoology: An introduction to the comparative anatomy, embryology and evolution of chordate animals (New ed.). Sidgwick & Jackson.

De Beer, Gavin. Vertebrate Zoology: An Introduction to the Comparative Anatomy, Embryology and Evolution of Chordate Animals. New ed. London: Sidgwick & Jackson, 1951.

De Beer, Gavin. Vertebrate Zoology: An Introduction to the Comparative Anatomy, Embryology and Evolution of Chordate Animals. New ed. Sidgwick & Jackson, 1951.