Proc. of the lith annual refresher cours for nurserymen held at the Pershore College of Horticulture, Pershore Worcestershire on January 8th-10th 1976
(1976)
Internat. Union of Physiological Sciences Satelite Symposium Lester B. Pearson College of the Pacific Victoria, British Columbia, Canada July 19-22, 1986
(1987)
