1. AOAC 1984 Official Methods of Analysis (14th edn). Association of Official Analytical Chemists, Arlington, WA, USA.
2. The determination of nitrate in soil solutions by ultraviolet spectrophotometry
3. 1966 Laboratory Handbook for Oil and Fat Analysis. Academic Press, London, UK.
4. 1978 Chlorophylls and carotenoids. In: Handbook of Physiological Methods: Physiological and Biochemical Methods, ed. & . Cambridge University Press, Cambridge, UK, pp 5–70.
5. PROTEIN MEASUREMENT WITH THE FOLIN PHENOL REAGENT