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2. The nature and ecology of aesthetic experiences in the landscape;Chenoweth;Landscape Journal,1990
3. The plateau experience and the post-mortem life: Abraham Maslow's unfinished theory;Cleary;The Journal of Transpersonal Psychology,1995
4. Flow: The Psychology of Happiness;Csikszentmihalyi,1992
5. Values for Sustainability: The Necessity of Transcendent and Sacred Realms;Cock,1991