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2. Reid, Grant W. From Concept to Form in Landscape Design. New York : Van Nostrand Reinhold, 1993.

3. Wakita, Aigiro, Aijiro Wakita. Tokyo : Process Architecture Co. Ltd., 1993.

4. Wallschlacger, Charles and Cynthia Busic - Lynder. Basic Visual Cancepts and Principles. Ohio : Wm.C. Brown Publishers, 1992.

5. Wong, Wucius. Principles of Form and Design. New York : Van Nostrand Reinhold, 1993.