1. Audus LJ (1972) Plant growth substances, 3rd edn. Interscience, New York London
2. Carr DJ (ed) (1972) Plant growth substances 1970. Springer, Berlin Heidelberg New York
3. Ann NY Acad Sci,1967
4. Hillman JR (ed) (1978) Isolation of plant growth substances. Cambridge Univ Press, Cambridge London New York Melbourne
5. Jacobs WP (1979) Plant hormones and plant development. Cambridge Univ Press, Cambridge London New York Melbourne