1. Aschoff, J., 1964. Die Tagesperiodik licht- und dunkelaktiver Tiere. Revue suisse Zool.71, 538–558.
2. Bousfield, E. L., 1955. Ecological control of the occurrence of barnacles in the Miramichi Estuary. Bull. natn. Mus. Can.137, 1–69.
3. Buddenbrock, W. v., 1931. Untersuchungen über den Schattenreflex. Z. vergl. Physiol.13, 164–213.
4. —, 1952. Vergleichende Physiologie. Bd 1: Sinnesphysiologie. Birkhäuser, Basel, 504 pp.
5. Crisp, D. J. & Southward, A. J., 1961. Different types of cirral activity of barnacles. Phil. Trans. R. Soc. (B)243, 271–308.