Kappers, C. A., Huber, G. C., & Crosby, E. C. (1967). The Comparative Anatomy of the Nervous System of Vertebrates, Including Man: Vol. 1; Vol.2; Vol. 3. Hafner Publishing Company.

Kappers, C.U. Ariëns, G. Carl Huber, and Elizabeth Caroline Crosby. The Comparative Anatomy of the Nervous System of Vertebrates, Including Man: Vol. 1; Vol.2; Vol. 3. New york: Hafner Publishing Company, 1967.

Kappers, C.U. Ariëns, et al. The Comparative Anatomy of the Nervous System of Vertebrates, Including Man: Vol. 1; Vol.2; Vol. 3. Hafner Publishing Company, 1967.