Woolley, P. (2005). Drawing towards watercolour: Exercises and techniques for improving your paintings. David and Charles.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWoolley, Peter. Drawing Towards Watercolour: Exercises and Techniques for Improving Your Paintings. Newton Abbot: David and Charles, 2005.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWoolley, Peter. Drawing Towards Watercolour: Exercises and Techniques for Improving Your Paintings. David and Charles, 2005.
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