APA
Plucknett D. L., Sprague H. B., . (1989). Detecting mineral nutrient deficiencies in tropical and temperate crops. Westview: Boulder Press.
Chicago
Plucknett Donald L, Sprague Howard Bennett, . 1989. Detecting mineral nutrient deficiencies in tropical and temperate crops. Westview: Boulder Press.
Harvard
Plucknett D. L., Sprague H. B., . (1989). Detecting mineral nutrient deficiencies in tropical and temperate crops. Westview: Boulder Press.
MLA
Plucknett Donald L, Sprague Howard Bennett, . Detecting mineral nutrient deficiencies in tropical and temperate crops. Westview: Boulder Press. 1989.