Zion, R. L. (1968). Trees: For architecture and the landscape. New York: Van Nostrand Reinhold.
Παραπομπή Chicago StyleZion, Robert L. Trees: For Architecture and the Landscape. New York: Van Nostrand Reinhold, 1968.
Παραπομπή MLAZion, Robert L. Trees: For Architecture and the Landscape. New York: Van Nostrand Reinhold, 1968.
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