1. Developments in Food Colours–1, ed. J. Walford, Applied Science Publishers, London, 1980.
2. Developments in Food Colours–2, ed. J. Walford, Elsevier Applied Science Publishers, London, 1984.
3. J. B. Harborne , Comparative Biochemistry of the Flavonoids, Academic Press, London, 1967.
4. Anthocyanins as Food Colors, ed. P. Markakis, Academic Press, New York, 1982.