If you are interested in learning more about the British artist Patrick Heron (1920-1999) a good book to start with would be Patrick Heron St Ives Artists by Michael McNay. It gives a good overview to the life and work of this Cornwall artist. It is a small book, 80 pages, but contains many illustrations, most in colour.
Another interesting book is Patrick Heron: Early and Late Garden Paintings, by Andrew Wilson. It is an exhibition catalog for an exhibition at Tate St Ives in 2001.
Both are published by the Tate.