1. Benett-Clark, T. A., 1959: Water relation of cells. Plant Physiology, New York and London, Academic Press, 105–192.
2. Crafts, A. S., H. B. Currier and C. R. Stocking, 1949: Water in the physiology of plants. Chronica Botanica, Waltham, Mass., 240 pp.
3. Eckhardt, F. E., 1960: Eco-physiological measuring techniques applied to research on water relations of plants in arid and semi-arid conditions. Arid Zone Research (UNESCO), 15, 139–171.
4. Greenidge, K. N. H., 1957: Ascent of sap. Ann. Rev. Plant Physiol., 8, 237–256.
5. Heath, O. V. S., 1959: The water relations to stomatal cells and the mechanism of stomatal movement. Plant Physiology, New York and London, Academic Press, 193–252.