Goldstein D.D. & Jessen W.E. (1990). Flotation Effect on Premenstrual Syndrome. Restricted Environmental Stimulation: Research and Commentary. pp.260-266. Toledo, Ohio: Medical College of Ohio Press.
Jessen W. (1993). The Effects of Consecutive Floats and Their Timing on Premenstrual Syndrome. Clinical and Experimental Restricted Environmental Stimulation: New Developments and Perspectives. pp. 281-288. New York: Springer-Verlag New York Inc.