What has the author Philip Thiel written?

Philip Thiel has written:
'Visual Awareness and Design' -- subject(s): Visual perception, Communication in design
'People, paths, and purposes' -- subject(s): Architecture, Architecture and society, City planning, Communication in architectural design, Design, Effect of environment on, Environmental aspects, Environmental aspects of Architecture, Environmental aspects of Design, Environmental policy, Environmental psychology, Human beings, Landscape architecture, Research
'Freehand drawing' -- subject(s): Drawing, Technique, Study and teaching