1. Bigelow, H. B. 1930. A developing viewpoint in oceanography. Science, 71, No. 1830, 84–89.
2. Bigelow, H. B. 1931. Oceanography: Its Scope, Problems and Economic Importance. Houghton Mifflin, Riverside Press, Cambridge.
3. Gran, H. H. 1912. Pelagic plant life. In: The Depths of the Ocean, J. Murray and J. Hjort (eds.), Macmillan, London, 307–386.
4. Helland-Hansen, B. 1912. Physical oceanography. In: The Depths of the Ocean, J. Murray and J. Hjort (eds.), Macmillan, London, 210–306.
5. Henderson, L. J. 1913. The Fitness of the Environment. Macmillan, New York.