References

Kardong, K.V. 2002. Vertebrates: Comparative Anatomy, Function, Evolution. 3rd ed. McGraw Hill.
    p 665-672.

Tansley, K. 1965. Vision in Vertebrates. Science Paperbacks.

Welty, J.C., Baptista, L. 1988. The Life of Birds. 4th ed. Saunders College Publishing. p 85-88.

Wolff, E. 1968. Anatomy of the Eye and Orbit. 6th. W.B. Saunder's Co. p.225, 253, 271, 451, 464-515.
 


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