1. Fertiliser Re,1994
2. and A review of recent UK studies to improve fertilizer-N recommendations for cereals. Proc 11th World Fertilizer Congr, Fertilisation for Sustainable Plant Production and Soil Fertility. Gent, Vol III, pp 419-435 (1997).
3. The Nitrogen;Sylvester-Bradley,1982
4. The Analysis,1986
5. Recommended varieties of cereals, 1986. Farmers Leaflet No 8, NIAB (1985).