Gladstone, R. J., & Wakeley, C. (1940). The pineal organ: The comparative anatomy of median and lateral eyes, with special reference to the origin of the pineal body; and a description of the human pineal organ considered from the clinical and surgical standpoints. Baltimore: Williams & Wilkins.

Gladstone, Reginald John, and Cecil Wakeley. The Pineal Organ: The Comparative Anatomy of Median and Lateral Eyes, With Special Reference to the Origin of the Pineal Body; and a Description of the Human Pineal Organ Considered From the Clinical and Surgical Standpoints. Baltimore: Williams & Wilkins, 1940.

Gladstone, Reginald John, and Cecil Wakeley. The Pineal Organ: The Comparative Anatomy of Median and Lateral Eyes, With Special Reference to the Origin of the Pineal Body; and a Description of the Human Pineal Organ Considered From the Clinical and Surgical Standpoints. Baltimore: Williams & Wilkins, 1940.