Manual of plant growth stages and disease assessment keys.
APA Citation
Plant Pathology Laboratory (Harpenden, E. (1976). Manual of plant growth stages and disease assessment keys. Middlesex, England: Ministry of Agriculture, Fisheries and Food.
MLA Citation
Plant Pathology Laboratory (Harpenden, England). Manual of Plant Growth Stages And Disease Assessment Keys. Middlesex, England: Ministry of Agriculture, Fisheries and Food, 1976.
Warning: These citations may not always be complete (especially for serials).