Ulrich, R.S. and R. Parsons. 1992. Influences of passive experiences with plants on individual well-being and health. In: D. Relf (ed.). The Role of Horticulture in Human Well-Being and Social Development: A National Symposium. Timber Press, Portland, OR.
Focuses on the influences of visual contacts with plants on psychological and physiological well-being, and on health-related indicators. Particular emphasis is given to stress-reducing benefits of viewing vegetation.